Litmus test on an orange. A piece of blue litmus paper held against a freshly-cut face of an orange. The change of colour from blue to red means that the orange must be acidic. Oranges,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: | - |