Aurina

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Specification

Aurina relates to acidic triphenylmethane dyes and other substances pedobno this type changes its color depending on the acidity of the medium; Aurina is sometimes used as an indicator of when acidimetric titration.

Aurina obtained by the action of sulfuric acid to the mixture of phenol and oxalic acid.

Aurina prepared by heating phenol with sulfuric and oxalic acid, or by condensation of phenol with formaldehyde and oxidation of the resulting joint with a third molecule dioksidifenilmetana phenol.

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