50.6 MB (3.2 MB compressed)
3423 x 5165 pixels
29.0 x 43.7 cm ⏐ 11.4 x 17.2 in (300dpi)
TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Universal indicator paper. Universal indicator changes its colour depending on the pH of the solution. Here, left indicator strip has been immersed in an acidic solution (pH=2, 0.01M hydrochloric acid, HCl), and right strip has been immersed in a basic solution (pH=12, 0.01M potassium hydroxide, KOH).
Model release not required. Property release not required.