49.3 MB (3.5 MB compressed)
3370 x 5111 pixels
28.4 x 43.2 cm ⏐ 11.2 x 17.0 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Universal indicator. Universal indicator was added to two test tubes containing solutions with different pH values. Left: acidic (0.01M hydrochloric acid), pH=2. Right: neutral (buffer solution), pH=7. Universal indicator changes its colour depending on the pH of the solution.
Model release not required. Property release not required.