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[1] [2] The term is usually used in the context of clothes. In general, clothing should be tested for colour fastness before using bleach or other cleaning products. [3] Lightfastness, wash fastness, and rub fastness are the main forms of colour fastness that are standardized. The light fastness of textile dye is categorized from one to eight ...
[1] [2] The American Association of Textile Chemists and Colorists pioneered the work on these test methods and together with the ASTM D13 committee. [3] Normally two identical dye samples are created. One is placed in the dark as the control and the other is placed in the equivalent of sunlight for a three-month period. A standard bluewool ...
In grey scale the lightfastness is rated between 1–5. 1 being very poor and 5 being excellent lightfastness. [1] [2] [10] On ASTM scale the lightfastness is rated between I-V. I is excellent lightfastness and it corresponds to ratings 7–8 on Blue Wool Scale. V is very poor lightfastness and it corresponds to Blue Wool scale rating 1. [10]
A BIOS Color Attribute is an 8 bit value where the low 4 bits represent the character color and the high 4 bits represent the background color. The name comes from the fact that these colors are used in BIOS interrupts, specifically INT 10h, the video interrupt. When writing text to the screen, a BIOS color attribute is used to designate the ...
Anthraquinone itself is colourless, but red to blue dyes are obtained by introducing electron donor groups such as hydroxy or amino groups in the 1-, 4-, 5- or 8-position. [1] Anthraquinone dyestuffs are structurally related to indigo dyestuffs and are classified together with these in the group of carbonyl dyes .
(NCCl) 3 + dye-NH 2 → N 3 C 3 Cl 2 (NHdye) + HCl. The resulting dichlorotriazine can then be affixed to the cellulose fibre by displacement of one of the two chloride groups: [citation needed] N 3 C 3 Cl 2 (NHdye) + HO-cellulose → N 3 C 3 Cl(NHdye)(O-cellulose) + HCl. The fixation process is conducted in a buffered alkaline dye bath ...
They require an acidic dye bath, often using sulfuric acid and sodium sulfate mixtures (pH2-4), [7] together with leveling agents such as ethoxylated fatty amines. Milling dyes: These dyes are high molecule weight, with the result that migrates slowly. Consequently, they exhibit wet fastness, which is useful for dyeing wool materials.
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