Acid dyes have a lower affinity for silk than for wool and there is obviously less problem with level dyeing. The potion dyes show very good stability due to the long alkyl side chain in the molecule.
Neutral acid dyes are permanent-freeze or acid-fast dyes with medium to good wet fastness properties and some with poor fastness in light shades. Many neutral acid dyes are used only as their own shades.
Direct dyes are molecules that stick to the molecules Sof the fabric without the help of other formulas. A direct dye is defined as anionic dyes with an intrinsic affinity for cellulosic fibres, and is typically applied from an aqueous solution containing an electrolyte, either sodium chloride NaCl or sodium sulfate Na2SO4.
The dyeing process with direct dyes is quite simple, direct dyeing is usually done in a neutral or slightly alkaline passage, at or near boiling point, but post-treatment such as positive dye fixation, to enhance wet fastness has been necessary for most direct dyes.
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