49.6 MB (4.2 MB compressed)
5115 x 3392 pixels
43.4 x 28.7 cm ⏐ 17.1 x 11.3 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Universal indicator added to a beaker containing distilled water (weakly acidic). Universal indicator changes its colour depending on the pH of the solution. Red indicates a strong acid, yellow/orange indicates an acid, green is neutral, blue indicates an alkali, and purple indicates a strong alkali.
Model release not required. Property release not required.