49.5 MB (4.3 MB compressed)
5068 x 3417 pixels
42.9 x 29.0 cm ⏐ 16.9 x 11.4 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Universal indicator added to two beakers containing different solutions (left to right): acidic (vinegar), and alkaline (baking soda). The indicator changes the solution's colour, depending on it's pH.
Model release not required. Property release not required.