资料来源 : pyDict

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资料来源 : Webster's Revised Unabridged Dictionary (1913)

Phthalein \Phthal"e*in\, n. [See {Phthalic}.] (Chem.)
   One of a series of artificial organic dyes made as
   condensation products of the phenols with phthalic acid, and
   well represented by phenol phthale["i]n. 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.