What are the TA and CH buffers?

Texas Splash

Mod Squad
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#2
Test kits have TA and CH buffers which you add before titrating. What are these and what do they do?
R-0010 is calcium buffer, a strong base which prevents interference from magnesium.
R-0007 is thiosulfate, used to neutralize chlorine so it won't interfere with the test. Extra R-0007 can be added when the FC level is very high to help prevent the dye from bleaching out.