Page 99 - Shawl Weaving Artisan - TP

Textile & Handloom Exercise 1.6.60

Shawl Weaving Artisan - Wet Processing

Dyeing and fastness properties of natural dyes

Objectives : At the end of this exercise you shall be able to
• develop natural dyeing recipes with good fastness properties.

Requirements

Materials
• Dyeing container - 1 No. • Sharpener - 1 No.
• Gas heater - 1 No. • Eraser - 1 No.
• Thermometer - 1 No. • Notebook - 1 No.
• Stirring rod - 1 No. • Different natural dye sources - 1 No.
• Pencil - 1 No.

PROCEDURE

TASK 1: Dyeing process
1 Extract the dye: Extract the dye from the natural 5 Wait for the dyeing process: Allow the dyeing
source using a solvent such as water. process to complete, which can take from 30 minutes
2 Prepare the fabric: Wash and dry the fabric samples to several hours.
to remove any finishes or impurities. 6 Rinse and dry: Rinse the fabric gently with cold
3 Mordant the fabric: Apply a mordant to the fabric to water and dry it according to the fabric’s care
enhance colour fastness. instructions.
4 Dye the fabric: Immerse the fabric in the dye
extract and heat the mixture to the recommended
temperature.
TASK 2: Fastness testing
Light fastness test 5 Rate the color fastness based on the degree of color
1 Cut a sample of the fabric to be tested, approximately change, using a scale such as 1-5 (where 5 is the
10 cm x 10 cm (4” x 4”). highest rating).
2 Then place the sample in a light fastness tester or a Rubbing fastness test
natural sunlight for a specific period of time. 1 Cut a sample of the fabric to be tested, approximately
3 Compare the color of the test specimen before and 10 cm x 10 cm (4” x 4”).
after light exposure using a visual assessment. 2 Rub the sample with a white cotton cloth using a
5 Rate the color fastness based on the degree of color hand.
change, using a scale such as 1-5 (where 5 is the 3 Evaluate the amount of color transferred to the white
highest rating). cotton cloth using a visual assessment.
Wash fastness test 4 Rate the rubbing fastness based on the degree of
1 Cut a sample of the fabric to be tested, approximately color transfer, using a scale such as 1-5 (where 5 is
10 cm x 10 cm (4” x 4”). the highest rating).
2 Wash the sample in a washing machine using a 5 Evaluate the results: Evaluate the results of the
standardized detergent and water. fastness tests and assign a rating based on the
3 Rinse the sample thoroughly and dry it. degree of color change or fading.
4 Compare the color of the test specimen before and Ask trainees write all the details you observe during the
after washing using a visual assessment. process in the below mentioned table 1.
Table 1

Natural Dyeing Colour fastness Colour fastness to Colour fastness Fastness
S.No.
dye method to light washing to rubbing properties rating
1
2
3
4

87