Fill in the caption for each image.


___ is a chemical indicator that detects the presence of ___ when this substance is present, the indicator will turn from __ to
___

__ and __ are a chemical indicator that detects the presence of ___ when this substance is present, the indicator will turn from ___ to ___

Fill in the caption for each image is a chemical indicator that detects the presence of when this substance is present the indicator will turn from to and are a class=


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