Hello. I am experiencing the same issue . Taylor 2006c test kit. At about the 29ish mark, the color is decidedly purple. At around the 35-40 mark - then I notice it turns blue. Can I count the point where it turned blue as my CH hardness or is the fact that it is going from red to purple and then blue indicating that my results aren't accurate? Also - I saw you all mention the speedstir...do you use this only for CH or for all tests that you do? Thanks!
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