Rhodamine B
CAS 81-88-9
EC 201-383-9
Formula C28H31N2O3.Cl
MW 479.01 g/mol
Pigments & Colorants Printing & PackagingTextile, Leather & PaperPlastics & PolymersCoatings, Adhesives, Sealants & Elastomers Cross-linking & CuringCatalysis
Description
Rhodamine B (CAS 81-88-9) is a synthetic xanthene dye commercially known under names including Rheonine B, Brilliant Pink, D&C Red No. 19, and C.I. 45170. It carries no E-code designation and is not approved for food use in the EU. It is supplied as a green crystalline or red-violet powder with the molecular formula C28H31N2O3.Cl.
In textile and leather processing, Rhodamine B bonds to fibre substrates through ionic interaction, delivering intense fluorescent pink-red coloration. In photopolymer systems, it functions as a visible-light photoinitiator, absorbing green wavelengths to generate radicals that drive crosslinking and curing reactions in coatings and adhesive formulations.
Rhodamine B is available in technical and high-purity grades, with supply subject to REACH registration requirements under EC 201-383-9. It is classified under HS code 32041300 and typically packaged in fibre drums or multi-layer bags. Buyers should confirm grade specification against intended application, particularly where photochemical performance is critical.
In textile and leather processing, Rhodamine B bonds to fibre substrates through ionic interaction, delivering intense fluorescent pink-red coloration. In photopolymer systems, it functions as a visible-light photoinitiator, absorbing green wavelengths to generate radicals that drive crosslinking and curing reactions in coatings and adhesive formulations.
Rhodamine B is available in technical and high-purity grades, with supply subject to REACH registration requirements under EC 201-383-9. It is classified under HS code 32041300 and typically packaged in fibre drums or multi-layer bags. Buyers should confirm grade specification against intended application, particularly where photochemical performance is critical.
Physical Properties
| Melting Point | 165 °C |
| Density | 1.31 g/cm³ |
| Flash Point | 12 °C |
| Appearance | C.I. Food red 15 is a green crystalline or redviolet powdered solid |
| Color | Green |
| Form | Solid |
| Water Solubility | SOLUBLE |
| Refractive Index | 1.6500 (estimate) |
| pH | 3-4 (10g/l, H2O, 20℃) |
| Log P | 1.9-2 |
Safety & Handling (Learn More)
Warning GHS05 GHS07
H
H302H318H335H412
P
P261P264P270P271P273P280P317P319P330P405P501P264+P265P301+P317P304+P340P403+P233P305+P354+P338
Trade & Regulatory
| HS Code | 32041300 |
| UN Number | 3077 |
| ADR Class | 9 |
| Packing Group | III |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 3 |
Other Names
Rheonine BD&C Red No. 1911411 RedC.I. 45170BRILLIANT PINKBASIC VIOLET 10ADC Rhodamine BBRILLIANT PINK BCalcozine Red BX
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Raw Materials
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