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Rosolic acid, C.I. 43800, indicator, for microscopy

- Synonyms: Aurin, 4-[Bis(4-hydroxyphenyl)methylene]2,5-cyclohexadien-1-one
- C19H14O3
- M = 290,32 g/mol
- CAS [603-45-2]
- EINECS-No.: 210-041-8
- Solub. in water: (20 ºC): 1,2 g/l
- GHS-signal word: Warning
- GHS-H sentences: H315 - H319 - H335
- GHS-P sentences: P261 - P280 - P305+P351+P338 - P321 - P405 - P501a
- Tariff number: 3212 90 90 00
- Applications: microscopy, manufacture of dyes.

SPECIFICATIONS
pH range (yellow-red): 6,8 - 8,0
Absorption maximum l (in ethanol + 2 ml HCl 1N): 482 - 486 nm
Absorptivity (A1%/1 cm; l max.): > 1250
insoluble in C2H5OH : passes test
copper (Cu): max. 0,005 %
iron (Fe): max. 0,005 %
lead (Pb): max. 0,005 %
nickel (Ni): max. 0,005 %
residue on ignition (as SO4): max. 0,5 %
loss on drying (110 ºC, 1h): max. 10 %