Factory Sale Direct Red Brown RN Direct Brown 95.

Solubility:

Slightly soluble in cold water, with a solubility of approximately 35 g/L in hot water at 80–85°C, and the solution is orange-brown in color.

Direct Red Brown RN is slightly soluble in ethanol and insoluble in organic solvents such as acetone.

Acid-Base Reaction:

Concentrated sulfuric acid: Red-purple, turns to orange-brown precipitate upon dilution.

Concentrated hydrochloric acid: Brownish-black precipitate.

Concentrated sodium hydroxide: Red-brown precipitate.

Stability:

Direct Red Brown RN has moderate alkali resistance: stable at pH 7–10, but prone to precipitation in strong alkali.

Direct Brown 95 is sensitive to hard water and copper/iron ions, causing color changes, and requires soft water and anti-dyeing salts.

Sunlight fastness: 5–6 grades (high lightfastness), significantly better than ordinary Direct Brown 2.

Washing fastness: 2–3 grades (average, requires fixation).

Dry rubbing: 4 grades; Wet rubbing: 3 grades.

Sweat and climate fastness: Medium to high, suitable for outdoor and weather-resistant products.

Dyeing affinity: Direct Brown 95 has strong affinity for cotton, viscose, linen, and non-woven fabrics, with the highest dye uptake rate at 100°C.

Leveling / Migration: Direct Red Brown RN has good leveling properties and moderate migration, suitable for medium to deep shades.

Compatibility: Direct Red Brown RN can be stably mixed with Direct Yellow / Red / Blue / Gray for shades such as coffee, tobacco brown, and deep brown.

Industrial coloring:

Direct Brown 95 is used in paper, leather, water-based color pastes, and bamboo and wood fibers.

Advantages:

Direct Red Brown RN has excellent lightfastness (5–6 grades), and is less likely to fade outdoors.

Direct Brown 95 has bright and stable coloration with high red-brown recognition.

Direct Brown 95 has good solubility in hot water, making the dyeing process convenient.

Direct Red Brown RN has strong affinity and high dye uptake rate, suitable for medium to deep shades.

Disadvantages:

Direct Brown 95 has low solubility in cold water and requires hot water for dissolution.

Direct Red Brown RN has average washing fastness and requires fixation treatment.

Direct Red Brown RN is sensitive to hard water and metal ions, and requires water quality control.

Dissolution: Dissolve in hot water at 80°C, stir and filter, avoid direct dissolution in cold water.

Dosage of Direct Brown 95: 0.3–0.8 g/kg (0.03–0.08%), typically 0.5 g/kg for a rich red-brown color.

pH: Control at 8–10, avoid strong alkali (pH > 11).

Water quality: Use soft water and add chelating agents to prevent color changes due to metal ions.