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Acid test: blue litmus paper turns red

Acid test: blue litmus paper turns red

A500/0042

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Credit

ANDREW MCCLENAGHAN / SCIENCE PHOTO LIBRARY. ANDREW MCCLENAGHAN / SCIENCE PHOTO LIBRARY.

Caption

Acid test: blue litmus paper turns red in the presence of lemon juice (citric acid). The blue test paper is impregnated with litmus solution (derived from lichens) which turns red in the presence of acids; red litmus paper turns blue on contact with alkaline solutions.

Release details

Model release not required. Property release not required.

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