Litmus test on a lemon. A piece of red litmus paper held against a freshly-cut face of lemon. The lack of change of colour means that the lemon must be either acidic or neutral. Lemons,like all citrus fruits,contain citric acid | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 4252 px × 4252 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |