Page 98 - Shawl Weaving Artisan - TP

Textile & Handloom Exercise 1.6.59
Shawl Weaving Artisan - Wet Processing

Extraction of natural dyes

Objectives : At the end of this exercise you shall be able to
• analyse the extracted natural dyes from different sources.

Requirements
Materials

• Note book - 1 No. • Sharpener - 1 No.
• Pencil - 1 No. • Eraser - 1 No.

PROCEDURE

TASK 1: Extraction of natural dyes

Step 1: Harvesting and collection • Use a cheesecloth, filter paper, or a centrifuge to
• Collect plant materials such as leaves, flowers, separate the liquid from the solids.
roots, or bark. Step 5: Concentration

• Ensure the materials are fresh, healthy, and free of • Concentrate the extracted liquid through evaporation,
contaminants. distillation, or freeze-drying.
Step 2: Cleaning and preparation • This step helps to increase the color intensity and
• Clean the plant materials to remove dirt, debris, or stability of the dye.
impurities. Step 6: Standardization
• Chop, crush, or grind the materials to release their • Standardize the extracted dye to ensure consistency
colorant compounds. in color and quality.
Step 3: Extraction • This step may involve adjusting the pH, temperature,
• Use a solvent, such as water, ethanol, or glycerine, or concentration of the dye.
to extract the colorant compounds from the plant Step 7: Storage
materials. • Store the extracted dye in a cool, dark place to
• Heat, stir, or steep the mixture to facilitate extraction. preserve its color and stability.
Step 4: Filtration • Use airtight containers or glass jars to protect the

• Filter the extracted liquid to remove solids and dye from light, oxygen, and moisture.
impurities.

TASK 2: Ask trainees to extract the dye from natural materials like fruits, vegetables, leaves, flowers, stems
etc. and write all the observations in the below mentioned (Table 1)
Natural dye Extraction
S.No. Solvent Temperature PH
source method

1

2

3

4

5

86