phthaleins
plural of phthalein
Source: Wiktionary
Phthal"e*in, n. Etym: [See Phthalic.] (Chem.)
Definition: One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenol phthaleïn. Their alkaline solutions are fluorescent. Phenol phthalein, a white or yellowish white crystalline substance made from phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids, and as this reaction is exceedingly delicate it is used as an indicator.
Source: Webster’s Unabridged Dictionary 1913 Edition
27 June 2024
(noun) a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution; “he used a solution of peroxide and water”
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