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commercial test kits

Commercial test kits available

Adaptation of the o-cresophthalein complexone method
Hanna checkerColorimetric. 
Adaptation of Zincon method
$20.99 for 25 tests.
HachTitration. Calmagite EDTA & EGTA chelation test$63.89 for 100 tests (both calcium and magnesium)
 APIEDTA Titration.
contains Erichrom Blue Black R (listed as Mordant Black 17 in msds) as endpoint indicator.