Effect of hardness of water on fixation and total wash off percentage of reactive dyes when applied to cellulosic fiber
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This research investigates the effect of water hardness on the fixation and wash-off percentages of reactive dyes on cotton fabrics, focusing specifically on calcium, magnesium, and iron content. It was found that increased water hardness leads to higher wash-off percentages and lower fixation rates of dyes, indicating the significance of water quality in dyeing processes. The study emphasizes the necessity of using sequestering agents and natural soft water to optimize dyeing results while managing costs.
![International Journal of Scientific and Research Publications, Volume 4, Issue 9, September 2014 1
ISSN 2250-3153
www.ijsrp.org
Effect of Hardness of Water on Fixation and Total Wash off Percentage of Reactive Dyes When Applied to Cellulosic Fiber
Elias Khalil*, Joy Sarkar**
* Department of Textile Engineering, World University of Bangladesh
**Department of Textile Engineering, Khulna University of Engineering & Technology
Abstract- Dye-house water quality is the most important parameter to be confirmed before dyeing; precisely the presence of metal content i.e. Hardness. This research will investigate & analyses the impact of separate hardness (i.e. Calcium, Magnesium & Iron) on particular „Turquoise‟ (C.I. Reactive Blue 21) & a „High Exhaustion‟ class (C.I. HE Red 120, C.I. HE Yellow 84) of Reactive dye on cotton knitted-fabric. From evaluation of dyed fabric the range of metal content is sorted out where the quality starts to fluctuate as distinctive visible & spectral change of shade & fixation rate of the dye molecules has been found. The result of the work will help for further projection about water quality degradation in upcoming years & its effect on dyeing behavior, also the sustainability of present dyeing process to cope with the ever degrading quality of water.
Index Terms- Water hardness, Reactive dyes, Cellulosic fiber, Fixation & Wash off percentage
I. INTRODUCTION
n textile wet process, the most substantial & influential role is played by water. Although several alternatives are getting into consideration, water is undoubtedly the most suitable as dyeing medium. So the quality of coloration is vastly dependent on quality of water. Throughout the time there have been lots of studies & works to evaluate & standardize dye house quality, however chronologically the water quality is degrading so alarmingly that dye houses are required to be more conscious about this. „Right first time‟ dyeing hugely depended on the quality of water; quality of water is vast idea, the most important are the presence of metal ions (i.e. Hardness), alkalinity, turbidity etc. So before dyeing these parameters should be in control. This experimental work is to investigate the effect of Hardness in reactive dyeing, precisely the dyeing properties, build-up, strength & fastness etc. Hardness is generally referred to presence of calcium & magnesium in water. In this research dyeing with reactive dyes in different amount of hardness, artificially created in water, is done to investigate the dyeing behavior & other qualities which might be affected by Hardness. Dye-house water-hardness is defined as the presence of soluble calcium and magnesium salts in the water and is expressed as the CaCO3 equivalent [1]. The presence of hardness in the water can cause dye precipitation, and the precipitates can further promote dye aggregations, which results in color specks and loss of depth [2].
The objectives of this study is as to investigate different aspects of increased hardness as change in wash off and fixation percentage Usually the dyeing with reactive dye is commenced in neutral solution in presence of electrolyte. Here electrolyte acts to promote the exhaustion of the dye. Electrolyte neutralizes the negative charge formed in the fiber surface & puts extra energy to increase absorption. During this period dye just only migrate into the fiber surface but do not react with the fiber. Usually the higher shade percentage is ensured by higher electrolyte percentage and higher temperature. In dye Fixation stage, by the reaction of the reactive group of the dye and the fiber, dye-fiber covalent bond is formed. And running the exhaustion stage for few minutes an appropriate alkali is added to increase its PH (>10). The hydroxyl group of the cellulose is slightly acidic and due to the hydroxyl ion of the alkali, there causes some disassociation, forming cellulose ion.
And this cellulosate ion performs fixation by two distinct ways- (a) Nucleophilic Substitution & (b) Nucleophilic Addition [3].
Fig: 1 Nucleophilic substitution (a) and addition reactions (b) of reactive dyes with cellulosate ion
I](https://image.slidesharecdn.com/effectofhardnessofwateronfixationandtotalwashoffpercentageofreactivedyeswhenappliedtocellulosicfiber-140906123522-phpapp01/85/Effect-of-hardness-of-water-on-fixation-and-total-wash-off-percentage-of-reactive-dyes-when-applied-to-cellulosic-fiber-1-320.jpg)
![International Journal of Scientific and Research Publications, Volume 4, Issue 9, September 2014 2
ISSN 2250-3153
www.ijsrp.org
Unfortunately under the alkaline condition, necessary for dyeing cellulose, some reactive dye hydrolyzed by the act of OH- of water as nucleophile. After dyeing unreacted and hydrolyzed dyes present in the cellulose must be removed by washing [4].
II. MATERIALS AND METHODS
A. Materials
By creating hardness artificially in water, investigations are done on dyeing. Following soluble salts has been used for this purpose- Calcium Chloride (CaCl2), Magnesium Chloride (MgCl2), Ferric chloride (FeCl3). Following reactive dyes are chosen for this experiment
C.I. Reactive Blue-21. (Turquoise)
C.I. Reactive Red-120. (High-exhaust)
C.I. Reactive Yellow-84. (High-exhaust)
B. Water Hardness determination
The presence of calcium, magnesium and ferric salt in water is determined by the titration of sample water against a standardized solution (0.01M) of the di-sodium salt of Ethylene Di-amine Tetra Acetic acid (EDTA) solution [5].
C. Dyeing of fabric adding different hardness
Fabric is dyed adding different hardness in the dye bath in LABTEC dyeing machine following mentioned recipe on Table 1.1
Name of the machine: LABTEC Dyeing m/c
Bath: Glycerin bath
Maximum Temp: 150°C
Machine Type: Sample dyeing m/c
D. Dye liquor transmittance measurement by Minolta CM-2500D Spectrophotometer
Designed for versatility in various applications, the CM-2500d is a portable integrating sphere spectrophotometer incorporating Numerical Gloss Control. The CM-2500D is a high performance, low cost, portable spectrophotometer ideal for measuring the transmittance of dye liquor [6].
The Beer-Lambert law relates light absorption in a transparent material to concentration of colorant in the material and thickness of the material. The law is actually a combination of two separates laws- Beer‟s law relates absorbency of light by a colored solution to the absorbance of light by a colored solution to the thickness of the absorbing substance. This law is usually valid only when monochromic light is used. On the other hands, dye solution having high concentration or where dye is an aggregated state in the solution, Beer-Lambert law cannot be applied. That‟s why before applying this law in spectrophotometer; the solution has to be diluted around hundred times for the specific dyes to lower the concentration of the dye liquor [7].
E. Dyeing Procedure
The following sequence has been used in the dyeing of the fabric samples-
1. Bath set in room temperature.
2. Additional water, hard water, salt, sample fabric, dye solution added.
3. Temperature raised to 80°C at 2°C/sec.
4. Run the bath for 30 min.
5. Soda added at 80°C & then run for 1 hour.
6. Bath drop
Table 1.1: Recipe for dyeing with CaCl2, MgCl2 and FeCl3
Recipefor dyeing with CaCl2
Recipefor dyeing with MgCl2
Recipefor dyeing with FeCl3
TurquoiseBlue G – 2% Salt –45 g/l
Soda–15 g/l
M:L –1:8
Hard water-as per following amount
Temp.& Time –Soda at 80°C (30 min) & Run for 1 hr. at
80°C
SolaHE Red 3B –2% Salt –65 g/l
Soda–25 g/l
M:L –1:8
Hard water-as per following amount
Temp.& Time –Soda at 85°C (30 min) & Run for 1 hr. at
80°C
SolaYellow 4RN –2% Salt –65 g/l
Soda–25 g/l
M:L –1:8
Hard water-as per following amount
Temp.& Time –Soda at 85°C (30 min) & Run for 1 hr. at
80°C](https://image.slidesharecdn.com/effectofhardnessofwateronfixationandtotalwashoffpercentageofreactivedyeswhenappliedtocellulosicfiber-140906123522-phpapp01/85/Effect-of-hardness-of-water-on-fixation-and-total-wash-off-percentage-of-reactive-dyes-when-applied-to-cellulosic-fiber-2-320.jpg)
![International Journal of Scientific and Research Publications, Volume 4, Issue 9, September 2014 4
ISSN 2250-3153
www.ijsrp.org
B. Effect of FeCl3
Table 1.4: Fixation % and Total wash off % of Sola Yellow 4RN with hard water containing Ferric Chloride (FeCl3)
Bea-
ker
No.
Before
Dyeing
(Std.)
%
After
Dyeing
%
1st
Cold Wash- off %
2nd
Cold Wash- off %
Acid
Wash- off %
Hot
(70°C) wash- off %
Soap
(90°C) wash- off %
Final
Hot (70°C) wash- off %
Final
Cold wash- off %
Total
wash off %
Pick-
up
%
Fixation
%
1
100
10.23
4.231
2.015
1.025
3.079
6.953
3.025
1.009
21.34
89.8
68.433
2
100
10.97
4.958
2.125
1.195
3.856
6.852
3.715
1.252
23.95
89
65.077
3
100
9.64
5.025
2.659
2.032
3.965
7.025
3.698
2.095
26.5
90.4
63.861
4
100
10.15
5.869
2.891
2.791
4.015
7.893
3.967
2.125
29.55
89.9
60.299
5
100
9.25
5.024
3.265
1.925
7.065
11.015
3.852
0.125
32.27
90.8
58.479
6
100
9.61
5.534
3.958
1.015
7.025
11.625
3.265
1.025
33.45
90.4
56.943
IV. CONCLUSION
The change of fixation and total wash off percentage of high exhaust and turquoise reactive dyes on cellulosic fiber under changing of presence of metal ion is presented in this paper. Fixation is gradually decreases while wash off gradually increases for any kinds of metallic salt present in water. It is important to use a sequestering agent or water softening agent that is compatible to chemicals and auxiliaries used in this dyeing also cost effective and available. It is the best way to utilize natural soft water which eliminates water softening processing costs as well as achieving the desired result.
REFERENCES
[1] E. R Trotman, , “Deyeing and chemical technology of textile fibers”, 4th ed. London: Charles Griffin and Co, 1970, pp. 160–180.
[2] A. D Broadbent, “Basic Principles of Textile Coloration”, England: Society of Dyers and Colorists, 2001, pp. 130–135.
[3] J. Shore, “Cellulosic Dyeing,” England: Society of Dyers and Colorists, 2003, pp. 225-232
[4] M. Steve, T. P David, “Washing - Off reactive dyes after dyeing: Shortening the process,” 2008, http://www.fibre2fashion.com
[5] ASTM D1126 Standard Test Method for Hardness in Water, American Society for Testing and Materials, Annual book of ASTM Standards, 11(01), ASTM International, West Conshohocken, PA, USA, 2009
[6] N. Ahmed, D. P. Oulton and. A. Taylor, The use of reflectance measurements in the determination of fixation of reactive dyes to cotton” Wiley Publications Inc.2006, pp. 117–121
[7] W. S. Perkins,“Textile Coloration and finishing,”North Carolina : Carolina Academic Press, 1996
AUTHORS
First Author – Elias Khalil, M.Sc. (Textile), B.Sc.(Textile),Lecturer, Department of Textile Engineering, World University of Bangladesh. Email: eliaskhalil52@gmail.com
Second Author – Joy Sarkar, M.Sc. (Textile), B.Sc. (Textile), Department of Textile Engineering, Khulna University of Engineering & Technology, Khulna-9203, Bangladesh, Email: joy.ctet@gmail.com
Correspondence Author – Elias Khalil, M.Sc. (Textile), B.Sc.(Textile), Lecturer, Department of Textile Engineering, World University of Bangladesh. Email: eliaskhalil52@gmail.com](https://image.slidesharecdn.com/effectofhardnessofwateronfixationandtotalwashoffpercentageofreactivedyeswhenappliedtocellulosicfiber-140906123522-phpapp01/85/Effect-of-hardness-of-water-on-fixation-and-total-wash-off-percentage-of-reactive-dyes-when-applied-to-cellulosic-fiber-4-320.jpg)
Effect of hardness of water on fixation and total wash off percentage of reactive dyes when applied to cellulosic fiber
- 1. International Journal of Scientific and Research Publications, Volume 4, Issue 9, September 2014 1 ISSN 2250-3153 www.ijsrp.org Effect of Hardness of Water on Fixation and Total Wash off Percentage of Reactive Dyes When Applied to Cellulosic Fiber Elias Khalil*, Joy Sarkar** * Department of Textile Engineering, World University of Bangladesh **Department of Textile Engineering, Khulna University of Engineering & Technology Abstract- Dye-house water quality is the most important parameter to be confirmed before dyeing; precisely the presence of metal content i.e. Hardness. This research will investigate & analyses the impact of separate hardness (i.e. Calcium, Magnesium & Iron) on particular „Turquoise‟ (C.I. Reactive Blue 21) & a „High Exhaustion‟ class (C.I. HE Red 120, C.I. HE Yellow 84) of Reactive dye on cotton knitted-fabric. From evaluation of dyed fabric the range of metal content is sorted out where the quality starts to fluctuate as distinctive visible & spectral change of shade & fixation rate of the dye molecules has been found. The result of the work will help for further projection about water quality degradation in upcoming years & its effect on dyeing behavior, also the sustainability of present dyeing process to cope with the ever degrading quality of water. Index Terms- Water hardness, Reactive dyes, Cellulosic fiber, Fixation & Wash off percentage I. INTRODUCTION n textile wet process, the most substantial & influential role is played by water. Although several alternatives are getting into consideration, water is undoubtedly the most suitable as dyeing medium. So the quality of coloration is vastly dependent on quality of water. Throughout the time there have been lots of studies & works to evaluate & standardize dye house quality, however chronologically the water quality is degrading so alarmingly that dye houses are required to be more conscious about this. „Right first time‟ dyeing hugely depended on the quality of water; quality of water is vast idea, the most important are the presence of metal ions (i.e. Hardness), alkalinity, turbidity etc. So before dyeing these parameters should be in control. This experimental work is to investigate the effect of Hardness in reactive dyeing, precisely the dyeing properties, build-up, strength & fastness etc. Hardness is generally referred to presence of calcium & magnesium in water. In this research dyeing with reactive dyes in different amount of hardness, artificially created in water, is done to investigate the dyeing behavior & other qualities which might be affected by Hardness. Dye-house water-hardness is defined as the presence of soluble calcium and magnesium salts in the water and is expressed as the CaCO3 equivalent [1]. The presence of hardness in the water can cause dye precipitation, and the precipitates can further promote dye aggregations, which results in color specks and loss of depth [2]. The objectives of this study is as to investigate different aspects of increased hardness as change in wash off and fixation percentage Usually the dyeing with reactive dye is commenced in neutral solution in presence of electrolyte. Here electrolyte acts to promote the exhaustion of the dye. Electrolyte neutralizes the negative charge formed in the fiber surface & puts extra energy to increase absorption. During this period dye just only migrate into the fiber surface but do not react with the fiber. Usually the higher shade percentage is ensured by higher electrolyte percentage and higher temperature. In dye Fixation stage, by the reaction of the reactive group of the dye and the fiber, dye-fiber covalent bond is formed. And running the exhaustion stage for few minutes an appropriate alkali is added to increase its PH (>10). The hydroxyl group of the cellulose is slightly acidic and due to the hydroxyl ion of the alkali, there causes some disassociation, forming cellulose ion. And this cellulosate ion performs fixation by two distinct ways- (a) Nucleophilic Substitution & (b) Nucleophilic Addition [3]. Fig: 1 Nucleophilic substitution (a) and addition reactions (b) of reactive dyes with cellulosate ion I
- 2. International Journal of Scientific and Research Publications, Volume 4, Issue 9, September 2014 2 ISSN 2250-3153 www.ijsrp.org Unfortunately under the alkaline condition, necessary for dyeing cellulose, some reactive dye hydrolyzed by the act of OH- of water as nucleophile. After dyeing unreacted and hydrolyzed dyes present in the cellulose must be removed by washing [4]. II. MATERIALS AND METHODS A. Materials By creating hardness artificially in water, investigations are done on dyeing. Following soluble salts has been used for this purpose- Calcium Chloride (CaCl2), Magnesium Chloride (MgCl2), Ferric chloride (FeCl3). Following reactive dyes are chosen for this experiment C.I. Reactive Blue-21. (Turquoise) C.I. Reactive Red-120. (High-exhaust) C.I. Reactive Yellow-84. (High-exhaust) B. Water Hardness determination The presence of calcium, magnesium and ferric salt in water is determined by the titration of sample water against a standardized solution (0.01M) of the di-sodium salt of Ethylene Di-amine Tetra Acetic acid (EDTA) solution [5]. C. Dyeing of fabric adding different hardness Fabric is dyed adding different hardness in the dye bath in LABTEC dyeing machine following mentioned recipe on Table 1.1 Name of the machine: LABTEC Dyeing m/c Bath: Glycerin bath Maximum Temp: 150°C Machine Type: Sample dyeing m/c D. Dye liquor transmittance measurement by Minolta CM-2500D Spectrophotometer Designed for versatility in various applications, the CM-2500d is a portable integrating sphere spectrophotometer incorporating Numerical Gloss Control. The CM-2500D is a high performance, low cost, portable spectrophotometer ideal for measuring the transmittance of dye liquor [6]. The Beer-Lambert law relates light absorption in a transparent material to concentration of colorant in the material and thickness of the material. The law is actually a combination of two separates laws- Beer‟s law relates absorbency of light by a colored solution to the absorbance of light by a colored solution to the thickness of the absorbing substance. This law is usually valid only when monochromic light is used. On the other hands, dye solution having high concentration or where dye is an aggregated state in the solution, Beer-Lambert law cannot be applied. That‟s why before applying this law in spectrophotometer; the solution has to be diluted around hundred times for the specific dyes to lower the concentration of the dye liquor [7]. E. Dyeing Procedure The following sequence has been used in the dyeing of the fabric samples- 1. Bath set in room temperature. 2. Additional water, hard water, salt, sample fabric, dye solution added. 3. Temperature raised to 80°C at 2°C/sec. 4. Run the bath for 30 min. 5. Soda added at 80°C & then run for 1 hour. 6. Bath drop Table 1.1: Recipe for dyeing with CaCl2, MgCl2 and FeCl3 Recipefor dyeing with CaCl2 Recipefor dyeing with MgCl2 Recipefor dyeing with FeCl3 TurquoiseBlue G – 2% Salt –45 g/l Soda–15 g/l M:L –1:8 Hard water-as per following amount Temp.& Time –Soda at 80°C (30 min) & Run for 1 hr. at 80°C SolaHE Red 3B –2% Salt –65 g/l Soda–25 g/l M:L –1:8 Hard water-as per following amount Temp.& Time –Soda at 85°C (30 min) & Run for 1 hr. at 80°C SolaYellow 4RN –2% Salt –65 g/l Soda–25 g/l M:L –1:8 Hard water-as per following amount Temp.& Time –Soda at 85°C (30 min) & Run for 1 hr. at 80°C
- 3. International Journal of Scientific and Research Publications, Volume 4, Issue 9, September 2014 3 ISSN 2250-3153 www.ijsrp.org F. After treatment At first cold wash 1 and 2 were done in open bath without any reagent at room temperature on neutral condition for five minutes on a liquor ratio 1:5. Acid wash was done in open bath with green acid of 2g/l at room temperature for five minutes on same liquor ratio. Then hot wash in closed bath without any reagent at 700C for 5 minutes. Soap wash with standard soap of 2g/l at 900C for 5 minutes in closed bath. Then hot and soap wash again with previous condition. III. RESULTS OF FINDING In all cases it has been observed that with the increase of hardness, total wash off % is increased. During dyeing, aggregated dye molecules deposited on fabric surface. As these dyes are not fixed with the fiber, in washing stage they are very easily washed off. That is why, higher water hardness shows higher wash off %. With the increase of hardness, fixation % is gradually decreased. As the pick-up % were not very significantly with hardness, but wash off % increased, so total fixation is decreased with increase of hardness. A. Effect of CaCl2 Table 1.2: Fixation % and Total wash off % of Turquoise Blue G with hard water containing Calcium Chloride (CaCl2) Beaker No Before Dyeing (Std.) % After Dyeing % 1st Cold Wash- off % 2nd Cold Wash- off % Acid Wash- off % Hot (70°C) wash- off % Soap (90°C) wash- off % Final Hot (70°C) wash- off % Final Cold wash- off % Total wash off % Pick up% Fixation % 1 100 15.098 12.356 8.729 1.349 10.223 9.585 4.553 1.517 48.312 84.902 38.455 2 100 16.523 10.785 10.666 1.312 12.422 11.394 3.676 1.811 49.012 83.477 36.052 3 100 14.836 10.665 9.715 1.09 5.887 14.471 4.313 1.77 51.097 84.164 33.067 4 100 15.042 13.107 9.536 5.455 14.246 8.166 5.303 1.742 52.964 84.958 30.034 5 100 16.154 12.142 11.766 1.057 4.119 18.186 3.071 1.679 53.459 83.846 30.387 6 100 15.071 10.433 8.161 1.56 11.379 12.334 5.41 2.12 54.612 84.929 30.317 7 100 15.329 11.608 9.053 1.282 11.163 11.186 5.365 2.078 54.958 84.671 29.713 8 100 13.378 8.941 7.986 1.757 10.865 11.148 5.413 2.057 55.012 83.622 28.61 B. Effect of MgCl2 Table 1.3: Fixation % and Total wash off % of Sola Yellow 4RN with hard water containing Magnesium Chloride (MgCl2) Beaker No. Before Dyeing (Std.) % After Dyeing % 1st Cold Wash- off % 2nd Cold Wash- off % Acid Wash- off % Hot (70°C) wash- off % Soap (90°C) wash- off % Final Hot (70°C) wash- off % Final Cold wash- off % Total wash off % Pick up% Fixation % 1 100 8.645 4.231 2.015 1.025 3.079 6.953 3.025 1.009 21.34 91.36 70.018 2 100 8.64 4.958 2.125 1.195 3.856 6.852 3.715 1.252 23.95 92.07 68.117 3 100 8.39 5.025 2.659 2.032 3.965 7.025 3.698 2.095 26.5 91.61 65.111 4 100 7.769 5.869 2.891 2.791 4.015 7.893 3.967 2.125 29.55 92.23 62.68 5 100 7.684 5.024 3.265 1.925 7.065 11.015 3.852 0.125 32.27 92.32 60.045 6 100 7.195 5.534 3.958 1.015 7.025 11.625 3.265 1.025 33.45 92.81 59.358
- 4. International Journal of Scientific and Research Publications, Volume 4, Issue 9, September 2014 4 ISSN 2250-3153 www.ijsrp.org B. Effect of FeCl3 Table 1.4: Fixation % and Total wash off % of Sola Yellow 4RN with hard water containing Ferric Chloride (FeCl3) Bea- ker No. Before Dyeing (Std.) % After Dyeing % 1st Cold Wash- off % 2nd Cold Wash- off % Acid Wash- off % Hot (70°C) wash- off % Soap (90°C) wash- off % Final Hot (70°C) wash- off % Final Cold wash- off % Total wash off % Pick- up % Fixation % 1 100 10.23 4.231 2.015 1.025 3.079 6.953 3.025 1.009 21.34 89.8 68.433 2 100 10.97 4.958 2.125 1.195 3.856 6.852 3.715 1.252 23.95 89 65.077 3 100 9.64 5.025 2.659 2.032 3.965 7.025 3.698 2.095 26.5 90.4 63.861 4 100 10.15 5.869 2.891 2.791 4.015 7.893 3.967 2.125 29.55 89.9 60.299 5 100 9.25 5.024 3.265 1.925 7.065 11.015 3.852 0.125 32.27 90.8 58.479 6 100 9.61 5.534 3.958 1.015 7.025 11.625 3.265 1.025 33.45 90.4 56.943 IV. CONCLUSION The change of fixation and total wash off percentage of high exhaust and turquoise reactive dyes on cellulosic fiber under changing of presence of metal ion is presented in this paper. Fixation is gradually decreases while wash off gradually increases for any kinds of metallic salt present in water. It is important to use a sequestering agent or water softening agent that is compatible to chemicals and auxiliaries used in this dyeing also cost effective and available. It is the best way to utilize natural soft water which eliminates water softening processing costs as well as achieving the desired result. REFERENCES [1] E. R Trotman, , “Deyeing and chemical technology of textile fibers”, 4th ed. London: Charles Griffin and Co, 1970, pp. 160–180. [2] A. D Broadbent, “Basic Principles of Textile Coloration”, England: Society of Dyers and Colorists, 2001, pp. 130–135. [3] J. Shore, “Cellulosic Dyeing,” England: Society of Dyers and Colorists, 2003, pp. 225-232 [4] M. Steve, T. P David, “Washing - Off reactive dyes after dyeing: Shortening the process,” 2008, http://www.fibre2fashion.com [5] ASTM D1126 Standard Test Method for Hardness in Water, American Society for Testing and Materials, Annual book of ASTM Standards, 11(01), ASTM International, West Conshohocken, PA, USA, 2009 [6] N. Ahmed, D. P. Oulton and. A. Taylor, The use of reflectance measurements in the determination of fixation of reactive dyes to cotton” Wiley Publications Inc.2006, pp. 117–121 [7] W. S. Perkins,“Textile Coloration and finishing,”North Carolina : Carolina Academic Press, 1996 AUTHORS First Author – Elias Khalil, M.Sc. (Textile), B.Sc.(Textile),Lecturer, Department of Textile Engineering, World University of Bangladesh. Email: [email protected] Second Author – Joy Sarkar, M.Sc. (Textile), B.Sc. (Textile), Department of Textile Engineering, Khulna University of Engineering & Technology, Khulna-9203, Bangladesh, Email: [email protected] Correspondence Author – Elias Khalil, M.Sc. (Textile), B.Sc.(Textile), Lecturer, Department of Textile Engineering, World University of Bangladesh. Email: [email protected]