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.
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Details
Creative#:
TOP15088502
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
No
Property Release:
No
Right to Privacy:
No
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