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71.5 MB (738.2 KB compressed)
5000 x 5000 pixels
42.4 x 42.4 cm ⏐ 16.7 x 16.7 in (300dpi)
INNA BIGUN / SCIENCE PHOTO LIBRARY INNA BIGUN / SCIENCE PHOTO LIBRARY
Illustration of litmus liquid and litmus paper results from tests in solutions with acidic, alkaline and neutral pHs.
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