**Calculation for Lab Deep:****Recipe Calculation Formula :**

**Dye**= (Shade % * Weight of the fabric in gm )/Stock solution %

**Or,**

**Required solution = WP / C**

Where ,

W = weight of fabric, yarn, or

**fiber**

P = shade percentage

C = concentration of stock solution

CC = cubic centimeter .

**For auxiliaries (chemicals) the formula is as below**:

__Required amount of solution (mls)__= (g/l required * wt of substrate * LR )

**/**(10 * concentration (%) of stock soln)

**For addition of auxiliaries in solids form such as salt the formula is :**

__Salt in g/l__= (Required amount (%) * Sample weight * LR)

**/**1000

**Conversion formula from percentage to g/l is as below :**

__g/l__= Required amount (%) * 10 .

Calculation of Dyeing Recipe |

**If alkali conc. Is given in Be. then the formula to calculate this in g/l is as follows :**

__Required amount of solution (mls)__= (g/l required * wt of substrate * LR)

**/**(10 * concentration (%) of stock soln )

**Or ,**

= (Required amount (%)* wt of substrate * LR) / (Concentration (%) of stock soln)

**Or,**

__Required alkali soln in c.c.__= ( g/l required * wt of substrate * LR)

**/**(10* conversion value from Be. to g/l of alkali )

**Or ,**

__Required alkali soln in c.c.__= (Required amount (%) * wt of substrate * LR)

**/**conversion value from Be. to g/l of alkali

**Example :**

**Suppose a lab deep of a fabric sample (1*1 rib) has to be formed with following dyes & chemicals :**

**Dyes:**

1. Rema Blue RR = 1.122%

2. React Red KHW = 2.014%

3. React Yellow KHW = 1.486%

- Salt = 70%
- Soda Ash (conc.20%) = 5 g/l
- Caustic Soda (38 Be) = 1.32%
- L: R = 1:8
- Sample Wt. = 5 gm
- % Stock Soln = 1

**Therefore, recipe calculation for dyes and auxiliaries in g/l will be as follows :**

**For dyes :**

We know ,

__Dye__= (Shade % * Weight of the fabric in gm )

**/**(Stock solution % )

For,

1. Rema Blue RR = (1.122*5)/1=5.61 g/l

2. React Red KHW = (2.014*5)/1= 10.07 g/l

3. React Yellow KHW = (1.486*5)/1= 7.43 g/l .

**For auxiliaries :**

We know ,

__Salt in g/l__= (Required amount (%) * Sample weight * LR)

**/**1000

**.**

**. .**

__Required Salt__= (70*5*8)

**/**1000 = 2.8 gm .

**For Soda ash(conc.20%) :**

We know ,

__Required amount of solution (mls)__= (g/l required * wt of substrate * LR)

**/**(10 * concentration (%) of stock soln )

**.**

**. .**

__Required amount of soda ash in C.C.__= (5*5*8)

**/**(10*20) = 1.0

**For Caustic soda (38 Be.) :**

We know ,

__Required alkali soln in c.c.__= (Required amount (%) * wt of substrate * LR )

**/**conversion value from Be. to g/l of alkali

**.**

**. .**

__Required caustic soda__= (1.32*5*8)/441 = 0.12 c.c.

[since 38 °Be.NaOH= 441 gm NaOH 100% per 1lit NaOH soln]

Extra Water required :

Extra Water required :

= M:L – (required water to make soln of dyes & auxiliaries) = (5*8) – [(5.61+10.07+7.43) + (1.0+0.12) ]

= 40 – 24.112

= 15.77 (Salt is added in solid form)

**Equipments of Recipe Section:**

- Microprocessor pH Meter (Hanna Instrument)
- Digital pipette
- Digital Weighting Meter with Glass Box (Explorer, USA)