Dyeing Fabrics

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Topics: Dye
PICRIC ACID (DIRECT DYE):
Take about 60 mL of water in a 400 mL beaker. Add 2-3 drops of concentrated sulphuric acid and about 0.5 g of Picric Acid to it. Stir the solution with a wooden stick and warm over a hot water bath. Immerse one piece of each wool, cotton, polyester, nylon and terecot into it. When the pieces are thoroughly wetted in dye solution remove these with the help of forceps. Wash these with the help of warm water till the washing is colourless. Dry the pieces and note the results.

INDIGO (VAT DYE):
Take about 50 mL of water in a beaker. Add about 0.1 g (one pellet) of sodium hydroxide, 0.1 g of Indigo and 0.5 g of sodium hydrogen sulphite and shake gently until the solution becomes somewhat green. (Add some more sodium hydrogen sulphite if the Indigo powder did not dissolve). Immerse the pieces of cotton, polyester, nylon, terecot and wool in the dye solution. When the pieces are thoroughly wetted in dye solution remove these with the help of forceps and squeeze between folds of rough filter paper. Hang the pieces to dry in air and allow the leuco Indigo to become oxidized to blue indigo. Wash the pieces well with water and note the results.

PHENOLPHTHALEIN:
Take about 50 mL phenolphthalein in a beaker. Immerse the pieces of cotton, polyester, nylon and wool in the dye solution. When the pieces are thoroughly wetted in dye solution remove these with the help of forceps and allow them to dry in air and note the results.

PHENOLPHTHALEIN (IN SODIUM HYDROXIDE):
Take about 50 mL phenolphthalein in a beaker. Add a few drops of sodium hydroxide to it. Immerse the pieces of cotton, polyester, nylon and wool in the dye solution. When the pieces are thoroughly wetted in dye solution remove these with the help of forceps and allow them to dry in air and note the results.

METHYLENE BLUE:
Take about 50 mL of methylene blue in a beaker. Immerse the pieces of cotton, polyester, nylon and wool in the dye solution. When the pieces are thoroughly

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