Molekula
Rosolic acid (C.I.43800)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Rosolic acid (C.I.43800) is a synthetic triphenylmethane dye used as an acid-base indicator and analytical stain. It also serves as an intermediate in the manufacture of other dyes. It appears as a yellow to orange crystalline powder. CAS: 603-45-2, Molecular formula: C19H14O3, Molecular weight: 290.31 g/mol. Store at ambient temperature. Signal word: Warning. Molekula supplies Rosolic acid (C.I.43800) from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — £49.80 per pack ex VAT · £59.76 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
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Specifications
| Property | Value |
|---|---|
| Appearance | Dark reddish powder |
| Loss on Drying | <5.0% |
| Dye Content | >85% |
| Absorptivity | 2096 (E1% in a 1cm cell, in Ethanol + 5ml 1N HC1 at max) |
| Transition Range | pH 5.0 - 6.8 yellow - pink |
| Solubility at 0.1% (95% Ethanol) | Clear solution |
| Wavelength of Max. Absorption | 486nm (E1% in a 1cm cell, in Ethanol + 5ml 1N HC1 at max) |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 43244692 |
| CAS Number | 603-45-2 |
| IUPAC Name | 4-[bis(4-hydroxyphenyl)methylidene]cyclohexa-2,5-dien-1-one |
| EC Number | 210-041-8 |
| Molecular Formula | C19H14O3 |
| Molecular Weight | 290.31 |
| Exact Mass | 290.0943 |
| SMILES | C1=CC(=O)C=CC1=C(C2=CC=C(C=C2)O)C3=CC=C(C=C3)O |
| InChIKey | FYEHYMARPSSOBO-UHFFFAOYSA-N |
| InChI | InChI=1S/C19H14O3/c20-16-7-1-13(2-8-16)19(14-3-9-17(21)10-4-14)15-5-11-18(22)12-6-15/h1-12,20-21H |
| PubChem CID | 5100 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29145000 |
| Tariff Code | 2914500090 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 2,5-Cyclohexadien-1-one, 4-[bis(4-hydroxyphenyl)methylene]-
- 4-(Bis(p-hydroxyphenyl)methylene)cyclohexa-2,5-dien-1-one
- 4-[bis(4-hydroxyphenyl)methylene]cyclohexa-2,5-dien-1-one
- 4,4'-Dihydroxyfuchsone
- 4(bis(p-hydroxyphenyl)methylene)-2,5-cyclohexadien-1-one
- Aurin
- Aurin No. 555
- Aurine
- C.I. 43800
- Corallin
Frequently asked questions
What is Rosolic acid (C.I.43800) used for?
Rosolic acid is primarily used as an acid-base indicator, changing from yellow to red over approximately pH 6.8–8.2, and as a stain in analytical and laboratory applications.
What is the chemical formula and molecular weight of Rosolic acid?
The chemical formula is C19H14O3 with a molecular weight of 290.31 g/mol.
How should Rosolic acid be stored?
Store at ambient temperature, protected from light and moisture, as specified by the safety data sheet.
What grade of Rosolic acid is available from Molekula?
Molekula supplies Rosolic acid in technical grade; purity details are available upon request.
Can Molekula supply Rosolic acid in bulk?
Yes, Molekula can supply Rosolic acid in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with a Rosolic acid order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation can be provided upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.