PHTHALIN
Noun
phthalin (countable and uncountable, plural phthalins)
(chemistry) A colourless crystalline substance obtained by reduction from phthalein, into which it is easily converted by oxidation.
(chemistry) Any of the series of which phthalin proper is the type.
Source: Wiktionary
Phthal"in, n. (Chem.)
Definition: A colorless crystalline substance obtained by reduction from phthaleïn, into which it is easily converted by oxidation; hence, any one of the series of which phthalin proper is the type.
Source: Webster’s Unabridged Dictionary 1913 Edition
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