Basic Red 1 Appearance is dark purple red glitter crystal, soluble in water, showing greenish scarlet with fluorescence. It is soluble in alcohol with fluorescent yellow red. It is yellow in concentrated sulfuric acid and turns red after dilution. The concentrated nitric acid is apricot yellow, which is slightly diluted and turns orange. The aqueous solution plus sodium hydroxide has a red precipitate.
TRADE NAME:Rhodamine 6GDN,Basic Rhodamine 6GDN,Mitsui Rhodamine,Rhodamine J
Key Features
- Bright and uniform red color for various fibers
- Excellent water solubility and ease of application
- Good fastness to washing, light, and rubbing
- High affinity for both natural and synthetic fibers
- Stable under standard dyeing conditions
- Consistent batch-to-batch quality
Technical Specifications
- CAS NO: 989-38-8
- CI.NO: 45160
- Molecular Formula: C28H31ClN2O3
- Molecular Weight: 479.01
- Shade: Bright bluish-pink crystals or reddish purple powder.
| Light Fastness | 4 |
| Perspiration Fastness(fading) | 4-5 |
| Perspiration Fastness(stain) | 1 |
| Soaping(fading) | 3 |
| Soaping(stain) | 3-4 |
Application Features
K Value | f value | Solubility(g/L) | Other fiber stains(grade) | Dyeing pH value | Application classification |
| | — | — | — | cotton | viscose | nylon | polyester | wool | | |
— | — | — | — | — | — | — | — | — | — | — | Basic dye |
Colour Fastness Test
Fiber | Item | Sun exposure | Soaping | Perspiration |
| | Light | Midium | Dark | | |
Silk | Sample Change | 2 | 2 | 2 | 3 | 4~5 |
| White silk stained | — | — | — | 3~4 | 1 |
Basic Red 1 Use condition:
- 1.Silk dyeing:Basic Red 1(Rhodamine 6GDN) suitable for silk dyeing, carried out in an acetic acid bath. The dyed silk is fluorescent blue-red peach, which is yellower under tungsten light. When dyeing, it is usually made into a slurry with acetic acid and ethanol, then heated water ( 93~96°C) Dissolve, if used for silk graft dyeing, in order not to affect the pH value of the dyebath, it will be dissolved after ethanol alone. It is often dyed on silk products with direct dyeing. 1%, the fastness can reach 2~3.
- 2. Acrylic dyeing: It can be used for dyeing acrylic fiber, and the dye is dissolved with urea. Add acetic acid, sodium acetate and retarder when dyeing.
- 3. Wool dyeing: It can be used for wool dyeing, but the light fastness is very poor, only 1~2 grade.
- 4. Cotton dyeing: It can be used for dyeing and printing of tannin mordant cotton fiber, and the fiber is fluorescent blue-pink pink. However, the light fastness is very poor, the light fastness is 1 level, and the soaping fastness is 2~3.
- 5. Printing: Rhodamine 6GDN can be used for direct printing of silk fabrics, and the dosage should not exceed 0.05% of the original paste. Generally, it is neutral, acidic and straight. In the multi-color printing of dyes, it is used for embellishing colors. It does not print large and medium-sized patterns, and the dosage is not more than that of printing dextrin. 0.3%. Rhodamine 6GDN can be directly printed in the printing paste by adding the grafting agent during printing, which can also improve the color fastness. It can also be used as the coloring paste of other colors with stannous chloride as the whitening agent. The cotton cloth can be printed directly and the ground color is printed, but the color fastness is very poor.
- 6. Other: It can be used for dyeing leather and paper.
FAQ
What fibers are suitable for Basic Red 1?
Basic Red 1 is compatible with natural fibers like cotton, wool, and silk, as well as synthetic fibers such as nylon and acrylic, making it versatile for multiple applications.
How should Basic Red 1 be applied for best results?
It is recommended to dissolve the dye completely in water and apply under controlled temperature and pH conditions. Follow manufacturer guidelines for concentration to achieve uniform coloration.
Does Basic Red 1 provide good color fastness?
Yes, Basic Red 1 exhibits good resistance to washing, rubbing, and light exposure, ensuring that the color remains vibrant over time.
Can Basic Red 1 be mixed with other dyes?
Yes, it can be combined with other compatible basic or direct dyes to create customized shades, but pre-testing is advised to ensure color stability.
Is Basic Red 1 environmentally safe?
While Basic Red 1 is widely used industrially, it should be handled according to safety guidelines. Proper effluent treatment is recommended to minimize environmental impact.
