Just posted this in the thread below this one...
Yes, Part C is the powder. I think you are correct in that the likely problem is failure to dump out, clean and rinse the vial following the first test.
If your kit doesn't have Parts A, B, C and D..then disregard the instructions below....
Test 1:
Take a 3ml water sample and titrate using Part A until colour changes from red-orange to green. Count the drops. (for me, this is typically about 33-35 drops)
Test 2:
Clean/rinse the test vial; Take a new 3ml water sample.
Add 5 drops of Part B. Mix 30 seconds
Add one small spoonful (.15ml) of Part C powder. Mix shortly.
Titrate using Part D until you see colour change from pink-violet to light-blue. Count the drops. (for me, this is typically about 5-6 drops)
Math:
Subtract the # of drops in Test 2, from the # of drops on Test 1...and multiply by 50 to get your answer in ppm Mg. (34-5) = 29; 29x50 = 1450ppm
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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