Appearance is golden yellow powder. Acid Orange 7(Acid Orange II) is red yellow in water, soluble in orange. It is magenta in concentrated sulfuric acid, and it forms a brownish yellow precipitate after dilution. acid orange 7 is golden yellow in concentrated nitric acid. It is concentrated in concentrated sodium hydroxide solution. Insoluble. Adding concentrated hydrochloric acid to the aqueous solution has a brownish yellow precipitate; adding sodium hydroxide solution is dark brown. When the dyeing occurs, the copper ions tend to be red and dark; in the case of iron ions, the color becomes lighter and darker.
TRADE NAME:Acid Orange II,Acid Orange,AACL Orange II Conc,ABCOL Acid Orange II crude
Leveling (grade) | Displacement | Whitening | Solubility(g/L) | Metal ion effect(grade) | ||
copper | iron | chromium | ||||
4~5 | A | well | 300(100℃) | 3~4 | 4~5 | — |
Test Methods | fiber | Alkali resistance | Carbonization | Chlorination discoloration | Oxygen bleaching | Alkali fluff | Acid fluff | potting | soaping | Perspiration | Sun exposure | ||||
discolor | Staining | discolor | Staining | discolor | Staining | discolor | Staining | ||||||||
AATCC | wool | 3~4 | 5 | — | 1 | 1 | 1 | — | — | — | — | 1~2 | 1~2 | 1 | 5 |
ISO | wool | 4 | 4 | 2~3 | 1 | 1 | 1 | 2~3 | 1 | 1 | 1 | 1 | 2 | 2~3 | 4 |
Mainly used for silk and wool dyeing, widely used in wool dyeing, can be used for wool, silk and polyamide fiber fabric of direct printing, leather and paper color, can also be used in indicator and biological shading. Is tasted can be used as a food dye, heavy metal salt used in organic pigments.
1. Can be used for dyeing and direct printing of silk, wool and nylon.
2. Blending of blended fabrics: When wool and various fibers are dyed in the same bath, the nylon and silk are dyed, the silk is slightly shallow, and the cellulose fibers are slightly stained.
3.Acid Orange 7 can be used for leather dyeing and can also be used for biological dyeing. Pure products can be used as food dyes.
Yes, Acid Orange 7 is frequently blended with other acid dyes to achieve a wider spectrum of shades. Its bright orange tone makes it a common component in producing vivid mixed colors for textile and ink applications.
On wool and silk, Acid Orange 7 shows strong fiber affinity, resulting in deep, uniform shades. It also offers good penetration and levelness, which helps avoid patchy dyeing on delicate fabrics.
Acid Orange 7 has moderate lightfastness and wash fastness. While it provides brilliant coloration, it is generally recommended for applications where high fastness to sunlight is not the main requirement, or when used in combination with other dyes to balance fastness properties.
Yes, besides textiles and leather, Acid Orange 7 is also used in paper dyeing, water-based inks, and sometimes in laboratory staining applications due to its strong coloring ability and solubility in aqueous solutions.
