Litmus paper being dipped into an alkaline solution. Litmus paper is either red (as here) or blue. The red form turns blue in alkalis. The blue form turns red in acids.
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Details
Creative#:
TOP10163877
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
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