Pyrocatechol Violet TCI P0568

Chemical Identity

CAS No.: 115-41-3
PubChem: CID 66993·SID 87574740
Formula: C19H14O7S
Molecular weight: 386.4 g/mol
Reference databases: ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 4-[3-(3,4-dihydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]benzene-1,2-diol
SMILES: C1=CC=C2C(=C1)C(OS2(=O)=O)(C3=CC(=C(C=C3)O)O)C4=CC(=C(C=C4)O)O
InChIKey: RRRCKIRSVQAAAS-UHFFFAOYSA-N

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Pyrocatechol Violet from TCI (product code P0568) is an organic dye from the sulfonephthalein class. Analytical chemistry laboratories use it as a metallochromic indicator and as a spectrophotometric reagent. The compound forms coloured complexes with many metal ions, so analysts use it to mark the end point of complexometric titrations and to measure metal content by colorimetry. Pyrocatechol Violet has a long history in both classical and instrumental methods of analysis. It also appears in many standard procedures for determining metals in environmental samples, minerals, and industrial materials.

Laboratories choose this reagent because its colour change is very distinct and depends on pH and on whether metal ions are present. The free dye looks clearly different from the metal-bound form. This contrast makes visual observation easier and supports absorbance measurements on a UV-Vis spectrophotometer. The catechol structure has neighbouring hydroxyl groups that chelate metal ions strongly. As a result, the complexes are stable enough for quantitative analysis. These properties make Pyrocatechol Violet a dependable reagent for both routine and method-development work.

In Indonesian laboratories, Pyrocatechol Violet is used in university teaching and research labs, government testing facilities, and industrial quality control departments. Analysts working with environmental samples, mineral and mining materials, and industrial products use it in complexometric titrations and in colorimetric determination of metals. TCI's small pack sizes suit laboratories that use indicators in modest amounts but still need a consistent reagent from a recognised brand for their standard analytical procedures.

TCI brochures (PDF)

Titration Reagents and TLC Stains 2026-05-07 · p. 11

Related TCI products

Complexometric titration end-point detection: the dye forms coloured complexes with metal ions and changes colour clearly at the end point, which makes visual titration reliable and repeatable.
Colorimetric determination of metals: the metal-bound form has a different colour from the free dye, so analysts can relate colour intensity to metal concentration in a sample.
UV-Vis spectrophotometric analysis: the clear spectral difference between the free and complexed forms supports accurate absorbance measurements for quantitative metal analysis on standard spectrophotometers.
Metal analysis in environmental samples: the reagent is part of established standard procedures for determining metals in water and other environmental matrices tested by environmental laboratories.
Analysis of minerals and industrial materials: the catechol groups chelate metal ions strongly and form stable complexes, which supports quantitative work on mineral and industrial samples.

Brand	TCI (product code P0568)
CAS number	115-41-3
Molecular formula	—
Purity	—
Category	Analytical Chemistry > Analytical Reagents > Spectroscopy Reagents
Pack sizes	small laboratory packs as supplied by TCI
Physical form	—
Storage	follow the conditions on the TCI label and Safety Data Sheet

Chemical class: sulfonephthalein dye, metallochromic indicator

Store Pyrocatechol Violet in its original, tightly closed container in a cool, dry, well-ventilated place, away from direct sunlight and moisture. Always follow the storage conditions on the TCI label and Safety Data Sheet. Keep the reagent away from incompatible substances and label prepared indicator solutions clearly with the preparation date. Wear standard laboratory personal protective equipment, including gloves, safety glasses, and a lab coat, when handling the material. Avoid creating dust, avoid contact with skin and eyes, and wash your hands after use. Dispose of waste according to your laboratory's procedures and local regulations.

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