This document is a presentation on lab dips given by Shariful Islam from Uttara University. It discusses that a lab dip is a small swatch of dyed fabric used to visually show how the color will look before bulk production. The lab dip must be approved by comparing it to the original swatch under different light conditions before full production. The presentation provides examples of how to calculate dye, salt, and soda ash requirements for a lab dip based on the desired shade percentage. It stresses getting accurate lab dips approved by buyers before sending.

1. Hello everybody this
is
SHARIF
with you and you are watching
A presentation
on
Lab Dip
16/9/2017 6:17:25 AM

2. Shariful Islam
9th batch
ID: 031
Uttara university
Dept. of FDT
I am a person who is positive
About every aspect of life. To
become a respectable professional
person in the field of Garments
industry I am trying very hard.

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4. A lab dip is a visual aid on how the color will
look when dyed. The lab dip is typically done
on a small swatch of fabric, about 6" by 6" in
size.
Lab dips need to get approved before bulk
production.
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5.  To calculate the
 To compare dyed sample with swatch
by light Box or Spectrophotometer.
 To calculate revise recipe
 Finally approved Lab Dip
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6.  Sodium light matching
(show room).
 Tube light matching.  Sun light matching.
 Ultra Violet matching.
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8. Usually following calculations are followed:
Dye Solution = (Shade % * Sample Weight) / (Stock solution
%) (cc).
Salt = (Shade % * Liquor) / 1000 (gram per liter, gpl).
Soda Solution = (Shade % * 100 * Liquor) / (1000 * Stock
solution %) (cc).
 Common Stock Solutions:
 Red – 0.1%, 0.5%, 1.0%, 2.0% (very common)
 Yellow – 0.1%, 0.5%, 1.0%, 2.0% (very common)
 Blue - 0.1%, 0.5%, 1.0%, 2.0% (very common).
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9. Example Calculation for 0.5% Shade:
Sample wt. = 5 mg
Material liquor ratio = 1: 10
Total liquor (5 * 10) = 50 cc
Dye solution required = (5 * 0.5%) / 1% = 2.5 cc
Salt solution required = (50 * 25) / (20 * 10) = 6.25 cc
Soda ash solution required = (50 * 10) / (20 * 10) = 2.5
cc
Water required {50 - (2.5 + 6.25 + 2.5)} = 38.75 cc
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10.  To get the Lab dips from the processing mill and to get
approval from the buyer
 Must be sure of making the lab dips based on the swatches of
buyer
 Before sending the lab dips to the buyer, the merchandiser
should verify that they are closer to the required shade
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11. The end
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