I use it, it is a 2 step...
first one is I believe A, you add it until it changes from the orangy color to green. It takes me about 26-36 drops depending....
Then you rinse and then use the last 3, adding the initial drops then powder, then using the last drops until it changes color. (I am usually 6 drops)
You then take the results from the first test, subtract the amount of drops from the last addition in the second test, then multiply by 50
I hope this makes sense.
It took me a bit and some wasted testings to figure it out.
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