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FWIW, I just changed out the solution in my drop checker as it was starting to fade a bit, but was happy that it lasted about a month. In my new batch I added twice as much pH regent. While this makes the blue color very dark, the green and yellow colors tend to be much less pronounced. So I guess I am saying, don't be shy with the pH regent. The more you put in their the easier it will be to see the green/yellow color.
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