Direct Blue 71(TDS)

Application and parameters of Direct Blue 71

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Direct Blue 71

Direct Fast Blue B2RL
Direct Blue B2RL
Ambidirect Blue R
Bitafast Blue GLL
Blue 2-RL
Chrochem Direct Blue BRR
Direct Blue B2RL
Direct Blue FFC
Direct Blue GLL
Direct Light Blue FRL

CAS NO: 4399-55-7

CI.NO: 34140

Molecular Formula:C40H23N7Na4O13S4
Molecular Weight: 1029.87
Shade:dark blue

Direct Blue 71 Physical and Chemical properties

Density 1.31
Dyeing Depth % 2
Light Fastness 5-6
Washing Fatness 3-4
Rubbing Fastness(dry) 4
Rubbing Fastness(wet) 2-3

Application Features


SDC classification


metal ion effect(grade)

discharge property(grade)

other features














Colour Fastness Test

sun exposure






acid and alkali resistant

standard depth



original color change

white fiber stained

original color change

white fiber stained

original color change

white fiber stained




sulfuric acid

acetic acid

soda ash














Direct Blue 71 alias direct light blue B2RL, direct light blue B2R. The appearance is generally blue gray uniform powder. Water soluble, soluble in water blue, slightly soluble in cellosolve, very slightly soluble in alcohol, Insoluble in other organic solvents. The dye is blue to grayish black in concentrated sulfuric acid, red-violet purple precipitate after dilution; dark brown in concentrated nitric acid; insoluble in concentrated sodium hydroxide; blue-violet in concentrated ammonia. The aqueous solution added with concentrated hydrochloric acid has a blue precipitate, and the concentrated sodium hydroxide has a red-violet purple precipitate. The copper and iron ion shades slightly change.

Direct Blue 71 Application:

Widely used in viscose fiber dyeing, also used in viscose/PVA blends, cotton, and the carpet of dyeing and printing. Also used in leather, paper, soap, cheese, protein and formaldehyde resin color.

Use condition:

1. The dyed cotton or viscose fiber has a reddish-dark blue color. The dyeing rate is good, the transferability and levelness are poor. When dyeing, it is advisable to add salt to control the dyeing to obtain uniform color. After the dyeing stage, the dyeing solution should be naturally cooled to 80 ° C, which is beneficial to the dye exhaustion. After dyeing, the color light micro green is finished by urea-formaldehyde resin, and the color is brightly changed to green by the cyanoaldehyde resin; the red color is treated by copper sulfate, and then the resin is finished. , its sun fastness is not affected.

2. Used for dyeing rich fiber, the dyeing rate is very good, the color light is slightly darker than cotton. It can also be used for dyeing silk and its fabric, dyeing bath plus Yuanming powder and acetic acid. When dyeing vinyl fabric, dyeing The rate difference is lighter than blue. When cotton, viscose fiber and other fibers are dyed in the same bath, the wool is lighter than cotton and viscose fiber, the silk is lighter, the nylon is heavily stained, the second vinegar fiber, the three vinegar fiber, the polyester fiber. Acrylic fiber is almost non-staining.

3. Direct Blue 71 can be mixed with disperse dye in high temperature dyeing and blending fabric. The dyeing bath is heated to 120 °C under neutral conditions, or loaded with boiling dye. After the dye is dyed with polyester, the temperature is continued. After dyeing for half an hour, the cellulose fibers are fully colored, and the dye is exhausted, and the color light is substantially unchanged.

4. Used for continuous padding of cotton. After padding, it is treated with 10~25g/L yuan powder boiling bath, then steamed at 100~103°C for 1-3 minutes.

5. Used for direct printing of cotton or viscose fabric. When printing deep pattern, add urea and disodium hydrogen phosphate to prepare the printing paste.


20 or 25kg/compound bag, carton box, iron drum, fiber durm for powder dye and 1000kg/tank for liquid dye

Direct Blue 71 Material Safety Data Sheet (MSDS)

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