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Stock Photo: Colored litmus paper in hand isolated Image ID: 29872825   Release  information: N/A   Copyright: Jiri Slama   Keywords: acid, acidity, alkali, analytical, analyze, basic, change, chemistry, colored, education, effect, environment, essay, experiment, finger, glove, green, hand, isolated, lab, laboratory, litmus, negative, neutral, orange, paper, physics, positive, protect, result, safety, science, score, security, stripe, test, test-room, turnsole Similar Images Preview used to test the acidity or... close up of a indicator paper... close up of a ph paper alkaline testing indicator paper on a lab...