ArticlesScientific Apparatus and Laboratory Methods

FRUIT AND VEGETABLE PIGMENTS AS INDICATORS

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Science  09 May 1930:
Vol. 71, Issue 1845, pp. 486-487
DOI: 10.1126/science.71.1845.486

Abstract

(1) Solutions of many fruit pigments act as indicators.

(2) These solutions are easily prepared and stable, and the pH range of their color changes is in most cases conveniently near the neutral point

(3) As liquid indicators they can be used in titrating acids, but not bases

(4)Their greatest usefulness depends upon the fact that very satisfactory test papers can be made with them in a simple and inexpensive way