Acid Blue 7 is Soluble in water, but soluble in ethanol is blue. The strong sulfuric acid are olive green, yellow precipitation after diluted. A transparent green light blue aqueous solution at room temperature without gathered tendency, add sodium hydroxide subject to change after cooling,heated to boiling color from blue to violet precipitate.
TRADE NAME:Acid Sky Blue A,Patent Blue A,Youhaotracid Blue GS,AACL Patent Blue AS 250%,ABCOL Patent Blue A Conc,Acid Turquoise Blue A,Acid Turquoise Blue A,Acid Turquoise Blue 2G
Standard | Fiber | Soaping | Persperation Fastness | Oxygen bleaching | Light | |
Fading | Stain | |||||
AATCC | Wool | 3 | 3 | 3 | 2 | 1 |
ISO | Wool | 3 | 3-4 | 3 | 2 | 2 |
In dyeing copper and iron ions become dark green color. For heavy chromate salt not sensitive. For wool, silk and polyamide fiber fabric dyeing and printing, and can also be used in leather, paper, cosmetics, soap, biological and rubber color.
Acid Blue 7 works best on protein fibers (wool, silk) and polyamide fibers (nylon). It has limited uptake on cellulose fibers (cotton) unless used with special mordanting or after chemical modification; for cotton, consider reactive or direct dyes instead.
Consistent results are usually obtained in a mildly to moderately acidic range. Many mills start in the pH 2.5–4.5 window using acetic acid; exact pH depends on fiber type and dye concentration — validate on lab trials to avoid over-acidification which can damage protein fibers.
To green-shift, blend Acid Blue 7 with a small percentage of an appropriate yellow acid dye or a turquoise acid dye. To red-shift, add a touch of an acid violet or a warmer blue. Make incremental additions and sample at production concentrations before committing to bulk batches.
After dyeing, thorough rinsing, neutralization, and a commercial post-fixation step (e.g., cationic fixing agents or steam fixation for certain fabrics) markedly improve washfastness. Also consider combining with more wash-fast acid dyes in the original shade recipe.
Mixing with other acid dyes is common and generally compatible. However, combining different dye classes (reactive, direct, disperse) in a single bath is not recommended unless you control chemistry and sequence carefully—separate systems typically give more reliable results.
Store in a cool, dry place away from direct sunlight and moisture. Keep containers tightly closed. Avoid contamination with strong acids, alkalis or oxidizing agents; follow supplier SDS for long-term storage guidance.
Run a lab sample at the mill’s intended liquor ratio with incremental pH trials (for example pH 2.5, 3.5, 4.5), a standard temperature ramp, and replicate the intended rinse/finish steps. Measure shade (spectrophotometer) and fastness (wash and light) to select the production recipe.
