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Universal indicator paper

Universal indicator paper

C023/8750

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Universal indicator paper. Strips of universal indicator paper that have been dipped into solutions of various pH values (hydrogen ion concentrations). From left are strongly acidic solutions (red, pH 1-3), then weaker acids (orange and yellow, pH 4-6), then weak alkalis (blue-green and blue, pH 8-10) and finally at far right strong alkalis (purple, pH 11-14). Neutral solutions (pH 7) show as green.

Release details

Model release not required. Property release not required.

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