Acid Dye Acid Red G Acid Red 1

Acid Red G is a monoazo, strong acid-soluble anionic dye.

1. Water Solubility: Solubility at room temperature is approximately 132 g/L; dissolves more rapidly in hot water, exhibiting excellent solubility in aqueous systems.  

2. Organic Solvents: Slightly soluble in ethanol and ethylene glycol ether; almost insoluble in acetone, esters, and other organic solvents.  

3. Reaction with Concentrated Sulfuric Acid: The solution appears bluish red; upon dilution with water, it turns yellowish red.  

4. Reaction with Concentrated Nitric Acid: Turns orange-red, gradually shifting to orange.  

5. Reaction with Concentrated Hydrochloric Acid: When concentrated HCl is added to the aqueous solution, a red precipitate forms; this precipitate can be re-dissolved in water.  

6. Reaction with Sodium Hydroxide: Upon gradual addition of caustic soda, the solution turns brownish orange.  

Water Quality Note: Preferably use soft water for preparation. Calcium and magnesium ions in hard water may cause dye precipitation and color spot formation.

1. Wool Dyeing: Begin dyeing at 40°C, add sodium sulfate and sulfuric acid to create a strongly acidic environment, then slowly raise temperature to 95–98°C and hold for 40–60 minutes before cooling and washing. Acid Red 1 is suitable for woven woolens, yarns, and roving.  

2. Silk Dyeing: Reduce acidity by switching to acetic acid bath (pH 3.8–4.2, temperature 85–90°C) to prevent fiber damage.  

3. Nylon Dyeing: Strongly acidic conditions yield deeper shades; Acid Red 1 can be used for direct printing on nylon fabrics.  

4. Printing: Direct printing on wool, silk, and nylon fabrics; fix with steaming, followed by washing to remove unfixed dye.

1. Textile Dyeing and Printing  

Dyeing and direct printing on wool, cashmere, yarn, silk, and nylon; primary dye for light to medium shades of bright red, with excellent compatibility for blending—ideal for producing magenta, chestnut red, and brownish red tones.  

2. Industrial Coloring  

Leather: Water-based dyeing of shoe uppers and apparel leathers  

Paper: Water-based coloring of specialty paper, decorative paper, and packaging paper  

Water-based Inks: Fountain pen inks and water-based marker dyes—formulation requires strict control over metal ions and pH  

Incense, crafts, and water-based pigment pastes

Advantages:  

1. Acid Red G offers bright, transparent, and vivid color with pure bluish red hue and rich saturation.  

2. Excellent water solubility, fast dissolution rate, and simple masterbatch preparation.  

3. Superior leveling performance, minimizing color unevenness and spotting.  

4. Stable dye uptake, overall good fastness, and excellent blending capability.  

Disadvantages:  

1. As a strong acid dye, its dyeing efficiency significantly decreases under neutral conditions.  

2. Highly sensitive to copper and iron ions, which alter hue; high requirements for equipment material and water quality during production.  

3. Color change and precipitation may occur under strongly alkaline conditions.

Standard package: 25kg woven bag / fibre drum. Store hermetically, keep dry. Do not store together with strong oxidants.