Molekula
Pyrogallol Red Metal Indicator
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 Metal Indicator is a synthetic organic compound used primarily as a metallochromic indicator in complexometric titrations, particularly for the determination of bismuth, cobalt, nickel, lead, cadmium and manganese. It is also used as the dye component in pyrogallol red–molybdate assays for measuring total protein in urine and other biological fluids. Its distinct color change on complexation with metal ions aids precise endpoint detection. This chemical has a CAS number of 32638-88-3, with the molecular formula C19H12O8S and a molecular weight of 400.36. It is stable under ambient storage conditions and carries no signal word. Molekula supplies Pyrogallol Red Metal Indicator 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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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 red to dark green to brown or black powder |
| Loss on Drying | (110℃) ≤5.0% |
| Suitability | (as indicator for metal titration) Conforms |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90037927 |
| 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
- 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
- PYROGALLOLRED
- 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 Metal Indicator used for?
Pyrogallol Red is primarily used as a metal indicator in complexometric titrations, particularly for detecting endpoints in chelatometric titrations of bismuth, cobalt, nickel, lead, cadmium and manganese. It is also used as the dye in pyrogallol red–molybdate protein assays.
What is the chemical formula and molecular weight of Pyrogallol Red?
The chemical formula is **C₁₉H₁₂O₈S** and the molecular weight is **400.36 g/mol**.
How should Pyrogallol Red Metal Indicator be stored?
Store at **ambient temperature** in a cool, dry place, away from direct sunlight and incompatible substances.
What grade or purity is available for Pyrogallol Red?
Molekula supplies **analytical reagent (AR) grade** Pyrogallol Red, suitable for laboratory applications requiring high precision.
Can Molekula supply Pyrogallol Red in bulk quantities?
Yes, bulk quantities are available upon request—contact our sales team for custom packaging and pricing.
What documentation comes with an order of Pyrogallol Red?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
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.