****!!!!****!!!! {Some calculations are inaccurate and vague, but some are reasonable.} Jim Humble mentioned in his book that when 15 drops of MMS is mixed with 5% acetic acid (vinegar), it produces about 3 mg of chlorine dioxide. I thought it might be good to take a look at this, and try to figure out how to go from 3 mg ClO2 to the concentration in PPM.