Normal for Chlorine test to turn back to pink?

Triumph65

0
Gold Supporter
May 10, 2018
123
Wimberley Texas
Pool Size
48000
Surface
Plaster
Chlorine
Liquid Chlorine
Noticed that after adding R-0871 and getting water to clear that it turns back to pink & then purple if left on workbench. The turning back to pink only takes a few minutes.

Is this normal?
 
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