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Universal indicator

Universal indicator

A500/0334

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Credit

ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY

Caption

Universal indicator in beakers of a variety of household products. From left to right, these are vinegar, mineral water, liver salts and bleach. Universal indicator (UI) changes colour depending on whether it has been added to an acid or an alkali. Vinegar is acidic, and turns the UI red. Mineral water is neutral, and turns it yellow- green. Liver salts are less acidic than vinegar, and turn the UI orange. Bleach is a very strong alkali, and turns the UI purple.

Release details

Model release not required. Property release not required.

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