49.4 MB (4.5 MB compressed)
3390 x 5094 pixels
28.7 x 43.2 cm ⏐ 11.3 x 17.0 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Universal indicator test. Universal indicator changes its colour depending on the pH of the solution. Here after an indicator strip was dipped in a buffer solution with pH=7.01, the strip colour changed to green indicating an neutral solution.
Model release not required. Property release not required.