Molekula
Pyrogallol Red
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
Pyrogallol Red is a synthetic organic dye used primarily in analytical chemistry and as a reagent in spectrophotometric assays. It is a red crystalline powder with a molecular formula of C19H12O8S and a molecular weight of 400.36 g/mol. It is stable at ambient temperatures and does not require special handling. Molekula supplies Pyrogallol Red 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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1 g — $82.10 per pack
Need a different quantity or pack?
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.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Dark red to dark green to brown or black powder |
| Melting Point | ≥300°C |
| Solubility | Dark purple solution (10mg/ml in 1M Ammonium hydroxide) |
| Sulphated Ash | <0.5% |
| Lambda max | 475 - 515nm in Ethanol |
| Identification (FT-IR) | Conforms to structure and standard |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 30384280 |
| CAS Number | 32638-88-3 |
| IUPAC Name | 1,1-dioxospiro[2,1lambda6-benzoxathiole-3,9'-xanthene]-3',4',5',6'-tetrol |
| EC Number | 251-134-3 |
| Molecular Formula | C19H12O8S |
| Molecular Weight | 400.36 |
| Exact Mass | 400.0253 |
| SMILES | C1=CC=C2C(=C1)C3(C4=C(C(=C(C=C4)O)O)OC5=C3C=CC(=C5O)O)OS2(=O)=O |
| InChIKey | KUQNCHZOCSYKOR-UHFFFAOYSA-N |
| InChI | InChI=1S/C19H12O8S/c20-12-7-5-10-17(15(12)22)26-18-11(6-8-13(21)16(18)23)19(10)9-3-1-2-4-14(9)28(24,25)27-19/h1-8,20-23H |
| PubChem CID | 94437 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29349944 |
| Tariff Code | 2934999090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P308+313 IF exposed or concerned: Get medical advice/attention
- P314 Get medical advice/attention if you feel unwell
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, 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
- 1,1-dioxospiro[2,1lambda6-benzoxath
- 1,1-dioxospiro[2,1lambda6-benzoxathiole-3,9'-xanthene]-3',4',5',6'-tetrol
- 12,13,14,15-tetrahydroxyspiro[benzo[c]1,2-oxathiolane-3,9'-xanthene]-1,1-dione
- 3',4',5',6'-tetrahydroxyspiro[2,1-benzoxathiole-3,9'-xanthene]-1,1-dione
- 3',4',5',6'-Tetrahydroxyspiro[benzo[c][1,2]oxathiole-3,9'-xanthene] 1,1-dioxide
- KUQNCHZOCSYKOR-UHFFFAOYSA-N
- Pyrogallol sulfonphthalein
- Pyrogallolsulfonephthalein
- Spiro(3H-2,1-benzoxathiole-3,9'-(9H)xanthene)-3',4',5',6'-tetrol, 1,1-dioxide
- US8987474, PyrogallolRed
Frequently asked questions
What is Pyrogallol Red used for?
Pyrogallol Red is primarily used as a pH indicator in analytical chemistry, as a metallochromic (complexometric) indicator, and in the pyrogallol red–molybdate assay for determining total protein.
What is the chemical formula and molecular weight of Pyrogallol Red?
The formula is C19H12O8S with a molecular weight of 400.36 g/mol.
How should Pyrogallol Red be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade of Pyrogallol Red is available?
Molekula supplies Pyrogallol Red in analytical grade.
Can Molekula supply Pyrogallol Red in bulk?
Yes, Molekula can supply Pyrogallol Red in bulk quantities upon request.
What documentation comes with a Pyrogallol Red order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS).
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.