Question

methods of preparation of direct dye​

Answer 1

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The dyeing process with direct dyes is very simple, Direct dyeing is normally carried out in a neutral or slight alkaline dyebath, at or near boiling point , but a separate aftertreatment such as cationic dye fixing , to enhance wet fastness has been necessary for most direct dyeing .

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Answer 2

The dyeing process with direct dyes is very simple, Direct dyeing is normally carried out in a neutral or slight alkaline dyebath, at or near boiling point , but a separate aftertreatment such as cationic dye fixing , to enhance wet fastness has been necessary for most direct dyeing .

. A METHOD OF IMPROVING THE CHARACTERISTICS OF DIRECT AZO DYES SELECTED FROM THE GROUP CONSISTING OF STILBENE YELLOW (COLOR INDEX 620), STILBENE ORANGE (COLOR INDEX 621), DIRECT BROWN (COLOR INDEX 420), DIRECT ORANGE (COLOR INDEX 415), AND DIRECT VIOLET (COLOR INDEX 394), WHICH COMPRISES SUBJECTING SAID AZO DYES TO MECHANICAL WORK IN AN APPARATUS OPERATING BY ATTRITION AND SHEARING, AS DISTINGUISHED FROM IMPACT.