28.7 MB (1.5 MB compressed)
3872 x 2592 pixels
32.8 x 21.8 cm ⏐ 12.9 x 8.6 in (300dpi)
TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY TREVOR CLIFFORD PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Editorial use only.
Universal indicator paper being used to test the pH of dilute sulphuric acid (in beaker). The paper has turned red, indicating a pH of 1 - 2 (as shown on the comparison strip) and a strong acid.
Model release not required. Property release not required.