3:20 humates are not soluble in water under any pH. Why are you dissolving it in water? You keep using Humic acid and humate interchangeably but they are two different molecules. Not everything that dissolves in water and exhibit a colour change is humic acid. Even by your explanation, as a result of the colour change of your humizen product, shouldn’t it be a humin?. Fulvic ratio, active sites and functional groups of humic substances which are as a consequence of the “age of the mining” site and the extraction method determine the activity of humic substances.