Litmus paper test. Litmus paper changes colour in acidic or alkaline conditions. It is a mixture of lichen pigments. It turns red in acids (left) and blue in alkalis (right). Distilled water (H2O, centre) is neutral and does not cause a colour change.
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Creative#:
TOP10163780
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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