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Discussion Starter · #1 ·
I never used this before. I want to test for kh. I am supposed to add one drop at a time and watch for the color to go from blue to yellow.

Where I fail to understand is, do they mean the slightest sign of yellow tint? Or do I need to match the yellow on the back as close at possible??

If you know please test so I can have an accurate measurement. Thanks
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