![](https://nthumb.tpgimages.com/mid2_com_img/28103/24053/TOP22295856.jpg)
A strip of litmus paper turns red in more acidic solutions and blue in more basic solutions.
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Details
Creative#:
TOP22295856
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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