Basic Blue 9

Application Features

Colour Fastness Test

Basic blue 9 also called methylene blue, is a type of very popular dye. It is stable in air, but it is sensitive to light. It is economical and it has excellent brightness.

It is yellow green in concentrated sulfuric acid and turns blue after dilution. In the concentrated nitric acid, it was gray-green. The dye solution with sodium hydroxide was purple with dark purple precipitation. Adding hydrochloric acid did not change. Dyed in silk green light blue, tungsten light green dark. Dyed with tannin mordant cotton cloth green bright blue, tungsten light green.

used in dyeing fibers, silk, wool and linen. it is soluble in ethanol, chloroform, slightly soluble in pyridine, and it is insoluble in ethyl ether.

Use condition:

1. Silk dyeing: it can be used for silk dyeing, which is carried out in acetic acid bath, and is rarely used now.

2. Acrylic fiber dyeing: it can be used for acrylic fiber dyeing, including grade 2~3 fastness to sunlight, grade 4 fastness to soaping, grade 4 fastness to perspiration, grade 4 fastness to ironing, grade 4~5 fastness to dry friction, grade 4 fastness to wet friction and grade 4 fastness to dry cleaning.

3. Wool dyeing: used for wool dyeing, poor color fastness, only grade 1 fastness to sunlight.

4. Cotton dyeing: can be used in the dyeing of tannin mordant dyeing cotton fiber, the sunlight fastness grade 1, with soaping fastness level 3, water dip color fastness grade 2 ~ 3, with perspiration fastness 1 ~ 2 magnitude, iron fastness 4 ~ 5 level, dry rubbing fastness grade 3 ~ 4, 2 ~ 3 grade wet rubbing fastness, resistance to sulfuric acid fastness level 3, resistance to acetic acid fastness level 4, soda ash resistant fastness 1 ~ 2 level. Is now rarely used.

5. Others: can be used for paper, bamboo, wood coloring, but also can be used to make ink and lake pigments and biological, bacterial tissue dyeing, also can be used as a solvent dye.