47.7 MB (4.3 MB compressed)
4888 x 3411 pixels
41.4 x 29.0 cm ⏐ 16.3 x 11.4 in (300dpi)
TURTLE ROCK SCIENTIFIC / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE PHOTO LIBRARY
Testing apple for acidity. Litmus indicator changes its colour depending on the pH. Here a litmus indicator paper strip has changed colour from blue to pink after it was put in contact with a freshly sliced apple. The test shows that apple is acidic.
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