Litmus papers being dipped into different solutions. Litmus paper is either red or blue. The red form turns blue in alkalis. The blue form turns red in acids | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 5711 px × 3475 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |