Dyes
Dye is a synthetic and natural colouring matter which is used in solution to stain materials especially fabrics. All the coloured substances are not dyes. A coloured substance is termed as a dye if it fulfills the following conditions,
- It must have a suitable colour.
- It may be permanent on the fabric either directly or with the help of mordant.
- When fixed it must be fast to light and washing, i.e., it has to be resistant to the action of acids, water and alkalies, mainly to alkalies as washing soda and soap have alkaline nature.
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