# How to Calculate 0.5% Dyeing Shade in Fabric

Garment dyeing is one of the essential finishing operations which allows the manufacturer to produce special color effects. That won’t be feasible from continuous processed fabric. The demand from retailers for rapid response to fashion and color changes has resulted in some specialty garment manufacturers producing products. It can meet this requirement using fabric that has been previously prepared for dyeing. In this article, we will know about the working procedure to calculate 0.5% dyeing shade in fabric.

### Working Procedure to Calculate 0.5% Dyeing Shade in Fabric

Preparation:

• To prepare 0.1% Stock solution, it is necessary to mix 0.1 g dye and 100 cc water.
• Prepare 0.5% Stock solution, 0.5 g dyestuff is mixed with 100 cc water.
• To-prepare 1.0% & 2.0% Stock solution similar procedure is followed.
• To prepare 10% Stock solution of Soda ash, 10 g Soda is mixed with 100 cc water.

Calculation:
Usually, the following calculations are followed –

…………………………..Recipe % X Sample Weight
** Dye Solution = ………………………………………… (cc).
…………………………………..Stock solution %

……………..Recipe % X Liquor)
** Salt = ……………………………… (gram per liter, gpl).
…………………………..1000

…………………………….Recipe % X 100 X Liquor
** Soda Solution = ……………………………………… (cc).
…………………………….1000 X Stock solution %

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Sample wt. = 5 mg
Material liquor ratio = 1: 10
Total liquor (5 X 10) = 50 cc

…………………………………….5 X 0.5%
Dye solution required = ­­­­­­­­­­——————- = 2.5 cc
………………………………………….1 %

…………………………………..50 X 25
Salt solution required = ­­­­­­­­­­————— = 6.25 cc
…………………………………..20 X 10

………………………………………….50 X 10
Soda ash solution required = ­­­­­­­­­­————— = 2.5 cc
…………………………………………..20 X 10

Water required = {50 – (2.5 + 6.25 + 2.5)}
= 38.75 cc

Working Procedure:
All ingredients had been taken according to the recipe into the pot of the sample dyeing machine. At room temp the material had run then after 10 minutes started to raise the temperature at 1°C/ min. to get 60°C temperature. For performing the required dyeing temperature it took 30 minutes. The material had dyed at 60°C for 45 minutes. Then the temperature was reduced at room temperature within 10 minutes. The fabric washed in cold water & then the material was washed in 1 gm/l soap solution (liquor ratio 1:20) at 90°C temperature for 15 minutes. Then after rapidly cold washing the material was dried & preserved.

And then check the shade match with the required sample by the lighting box.

```Author of this Article:
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: [email protected]```

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