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#2
01-31-2010, 10:22 PM
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Are you using two separate samples of water? After you get your color change with reagent A you remember the number of drops and discard the water. Then with a fresh sample you add reagent B and C which should give you a pink color, then count the number of drops of D you use and subtract the D from A. I usually need 5 or 6 drops of D to get the color change.
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