My sample does not turn yellow when I add a drop of R-0630. I don't see an expiration date on this test, but I just bought it last season. Can I just add more drops to get it to turn yellow?
^^^^ This. When I test, my water turns yellow when adding a drop of the 630 reagent. The instructions say that’s what should occur, so I’d also wonder what was wrong if that didn’t happen.
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