An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Flint glass
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A soft, heavy, brilliant glass, consisting essentially of asilicate of lead and potassium. It is used for tableware, and foroptical instruments, as prisms, its density giving a high degree ofdispersive power; -- so called, because formerly the silica wasobtained from pulverized flints. Called also crystal glass. Cf.Glass.
Flint glass meaning & definition 1 of Flint glass.
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