About Direct Dyes And Range of Dyes that Gayatri Offers
Direct Dyes is a class of dyestuffs that are applied directly to the substrate in a neutral or alkaline bath. They produce full shades on cotton and linen without mordanting and can also be applied to rayon, silk, and wool. Direct dyes give bright shades but exhibit poor washfastness. Various aftertreatments are used to improve the washfastness of direct dyes, and such dyes are referred to as “aftertreated direct colors.”Direct Dyes are molecules that adhere to the fabric molecules without help from other chemicals. Direct dyes are defined as anionic dyes with substantivity for cellulosic fibres, normally applied from an aqueous dyebath containing an electrolyte, either sodium chloride (NaCl) or sodium sulfate (Na2SO4)..
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 .
Direct dyes are used on cotton, paper,leather, wool, silk and nylon. They are also used as pH indicators and as biological stains.
Application : it is used for water base dying of fabric
Direct Dyes Range of colours:
Sun Yellow RCH
Discharge Pink (Astra Flosine)
Direct Dyes Matching Shades
Red 12 B
Sunfast Red 5B /5BL
Minerawa Khanki G
Sunfast Blue GLL
Sunfast Yellow 5 GLL