Direct Brown 1 Soluble in water for orange brown, soluble in ethanol, slightly soluble in acetone and soluble fiber element, insoluble in other organic solvents. In nitric acid partly dissolved for red light brown, to orange brown; The strong sulfuric acid in the dark for the light purple to violet black, diluted into a brown. The dye solution to join 10% sodium hydroxide solution for yellow brown. Cellulose fiber of dyeing, dye well after sex is good, temperature in 100 ℃, affinity is the largest. Discharge of more sensitive to that fights.
Copper ions in dyeing and dark colored light yellow, meet iron ion to yellow.
Direct Brown 1 alias direct gold camel D3G, direct gold camel, direct yellow brown D3GE. Appearance is generally brown uniform powder. Water soluble, slightly sensitive to hard water. Dissolved in water orange brown, soluble in alcohol, slightly soluble in acetone And cellosolve, insoluble in other organic solvents. Dark red purple to purple black in concentrated sulfuric acid, brown after dilution; partially dissolved in concentrated nitric acid, reddish brown to orange brown. Yellow-brown. In case of copper ions, the color is yellow and dark, and the iron ions turn yellow.
TRADE NAME:Direct yellow brown D3G,Bismark Brown G,Direct Brown D3GE,Direct Brown MD
Dyeing depth % | 2 |
Insolubles % | 0.15 |
Washing Fatness | 2-3 |
Light Fastness | 2 |
Rubbing fastness(wet) | 3 |
Rubbing fastness(dry) | 4 |
Solubility(g/L) | SDC classification | Displacement(grade) | metal ion effect(grade) | discharge property(grade) | other features | ||
copper | iron | neutral | basic | ||||
— | C | 3~4 | 1 | 1~2 | 5 | 4 | — |
sun exposure | soaping | flooding | perspiration | rubbing | ironing | acid and alkali resistant | |||||||
standrd depth | 1/12 depth | original color change | white fiber stained | original color change | white fiber stained | original color change | white fiber stained | dry | wet | sulfuric acid | acetic acid | soda ash | |
— | — | 3 | 2 | 3~4 | 4 | 3~4 | 4 | 4 | 2 | 4~5 | 2~3 | 2 | 2~3 |
Direct Brown 1 Mainly used for cotton, such as glue of cellulose fiber dyeing, also can be used for silk, polyamide fiber, Sticky/brocade fabric dyeing, can also be used for the pulp and leather color.
Direct Brown 1 can be decomposed out of benzidine, which is a banned dye. The substitute dye is direct yellow brown N-D3G
As a starting guideline: use a liquor ratio of 1:20, a small lab dose of dye for shade trials (e.g., 0.5–2% owf depending on desired depth), and include an electrolyte or leveling agent according to your auxiliaries. Gradually raise temperature (if required by process) and follow with rinsing and a cationic after-fix to improve washfastness. Always run lab trials and adjust dosing and auxiliaries to match fabric construction and desired fastness.
Non-ionic wetting agents or specialized leveling agents help prevent patchiness; in some recipes small amounts of salt or electrolyte are used to promote exhaustion on coarse yarns. The precise choice depends on the fabric, so test different surfactants/levelers in lab runs to identify the optimum system.
Handle with standard chemical PPE—gloves, eye protection and ventilation. Store in a cool, dry place away from strong oxidizers and direct sunlight. For detailed safety and regulatory information consult the product SDS from your supplier before first use.
Yes — it can be formulated into printing pastes or used in padding systems, but paste formulation and fixation steps must be optimized (binders, pH, steaming or oxidation step if used). Conduct small-scale print trials and check final fastness after curing or fixation.
