Coroded Electrical Contacts Restore
Here's something else from Wikipedia. Remember litmus paper?
"The main use of litmus is to test whether a solution is acidic or basic. Wet
litmus paper can also be used to test water-soluble gases; the gas dissolves
in the water and the resulting solution colors the litmus paper. For instance,
ammonia gas, which is alkaline, colors the red litmus paper blue."
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