Litmus paper test. Litmus paper changes colour in acidic or alkaline conditions. It is a mixture of lichen pigments. It turns red in acids (left) and blue in alkalis (right). Distilled water (H2O,centre) is neutral and does not cause a colour change | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Andrew Lambert Photography |
Taille de l’image : | 4361 px × 3253 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |