Acid Blue 92

Acid Blue 92 Appearance is dark blue uniform powder,Soluble in water (purple) and cellosolve, slightly soluble in ethanol (red light blue), insoluble in other organic solvents. Dark sulfuric acid in dark sulfuric acid, blue after dilution; In case of concentrated nitric acid, it is purple sauce color, and then turns orange. Its aqueous solution is blue in concentrated hydrochloric acid, and it is reddish orange brown in concentrated sodium hydroxide solution.

TRADE NAME:Acid Navy Blue R,Acid Navy Blue P-4RB,Acid Blue 2R,Acid Blue R,Acid Navy Blue 2R,Alizarine Fast Wool Blue R,Ambicid Blue R,Apollo Nylon Fast Blue 2R,Best Acid Fast Blue 3R,Weak Acid Navy Blue R

Technical Specifications

• ‍CAS NO: 3861-73-2
• CI.NO: 13390
• Molecular Formula: C26H16N3Na3O10S3
• Molecular Weight:695.59
• Shade:Red light blue‍

Application Features

Colour Fastness Test

Application:

Can dyeing wool, silk, viscose, leather, paper and soap.

Acid Blue 92 Use condition:

• ‍1. It is used for dyeing and printing wool and silk, and can also be used for coloring leather, paper and soap.
• 2. Wool dyeing: In the weak acid bath, the pH value of the dyeing solution is adjusted to 4~6, and the leveling powder can be used as a retarding agent to improve the leveling property. The highest dyeing temperature is 85~95°C during the heating process. Dyeing with a concentrated acetic acid bath gives a deep red cyan color, which can be used for velvet, knitted fabrics and hats to dye cyan.
• 3. Silk dyeing: carried out in a weakly acidic bath with moderate leveling.
• 4. Blending of blended fabrics: When the wool is dyed in the same bath as the various fibers, the apparent color depth of the nylon is close to that of the wool, the silk is very shallow, and the cellulose fibers and the triacetate fibers are not stained.‍

FAQ

What fibers are best dyed with Acid Blue 92?

Acid Blue 92 shows strongest performance on protein fibers (wool, silk) and polyamide (nylon). It has high substantivity to cationic sites present in these substrates; synthetic cellulosic fibers (e.g., viscose) will require different dye classes or carriers.

What pH and temperature give the most consistent shade?

For typical exhaust dyeing, an acidic bath pH between 2.0 and 5.0 gives best exhaustion and shade reproducibility. Dyeing temperatures between 80–98°C (for wool/nylon) are commonly used depending on process — always validate on lab swatches before production.

How much dye should I use to achieve medium to deep shades?

Typical dosing depends on shade depth and fabric weight; many mills start with 0.5–2.0% owf (on weight of fabric) for medium-to-deep shades. Because Acid Blue 92 has high tinctorial strength, run a lab pad or small bath test to set your standard recipe.

What fastness can I expect and how can I improve it?

Wash and wet fastness on wool and nylon are generally good; light fastness is usually fair to moderate. Improve wet fastness with proper acid pH control and after-treatments (neutralizing and rinsing). Improve light fastness by blending with more light-fast co-dyes or applying UV-stabilizing finishing agents where appropriate.

Is Acid Blue 92 suitable for printing and padding?

Yes — Acid Blue 92 is suitable for printing pastes and padding liquors when formulated for acidic conditions. Use compatible thickeners and pH buffers, and conduct fixation trials (steam or thermofix steps) to optimize color yield and wet fastness.

Any handling, storage or effluent considerations?

Store in a cool, dry place in tightly sealed containers. For wastewater, acid dyes are colored effluents; remove color using appropriate treatment (coagulation/flocculation, adsorption or advanced oxidation) and follow local discharge regulations. Provide standard PPE (gloves, goggles) and avoid skin contact.