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Stock Photo: Close-up of a pH paper Image ID: 19771735   Release  information: N/A   Copyright: Sabine Kappel   Keywords: alkaline, analyze, base, basic, biology, black, blue, box, chemistry, closeup, danger, experiment, indicator, isolated, litmus, paper, ph, science, test, yellow Similar Images Preview close up of a indicator paper... used to test the acidity or... alkaline testing pink hydrangea flower ...