Universal indicator test on a lemon. A piece of universal indicator paper held against a freshly-cut face of lemon. The change of colour from yellow to red means that the lemon must be acidic. Lemons,like all citrus fruits,contain citric acid | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 4181 px × 4181 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |