A small bottle of universal indicator with pH chart on a desk in a laboratory, as used in a UK high school.

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A Universal indicator is a pH indicator composed of a solution of several compounds that exhibits several smooth colour changes over a pH value range from 1-14 to indicate the acidity or alkalinity of solutions.

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Size: 2400px × 3624px
Location: London UK
Photo credit: © Maurice Savage / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: acidity, alkalinity, bottle, chart, close, detail, education, flammable, high, indicator, material, ph, practicals, range, school, science, ui, uk, universal