25.0 MB (1.4 MB compressed)
3945 x 2219 pixels
33.5 x 18.8 cm ⏐ 13.2 x 7.4 in (300dpi)
BEAUTIFULCHEMISTRY.NET / SCIENCE PHOTO LIBRARY BEAUTIFULCHEMISTRY.NET / SCIENCE PHOTO LIBRARY
Wishbone (Torenia fournieri) flower that has had sodium hydroxide solution dropped on to its petal. Where the basic solution has hit, the petal has changed colour from purple to yellow. Many flowers act as indicators, changing colour on contact with acid or bases.
Model release not required. Property release not required.