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pH TEST PAPER: LITMUS -ACID & BASE.Testing an Apple & a Bar of Soap..The acidic apple turns blue litmus to red.  The basic bar of soap turns red litmus to blue.

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pH TEST PAPER: LITMUS -ACID & BASE.Testing an Apple & a Bar of Soap..The acidic apple turns blue litmus to red. The basic bar of soap turns red litmus to blue.

Copyright:© 2001 Paul Silverman - Fundamental Photographs

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Paul Silverman