1. Appearance: Black granular 2. Content: Humic Acid 45-60%; OM 55-70% 3. Hardness: 1.2kgmin 4. Size: 2-4mm... DescriptionHumic acid powder is a high polymer heterogeneous aromatic hydroxyl carboxylic acid. It is black brown powder or granular, insoluble in water and is of weak acidity, easily soluble in alkali. Humic acid powder comprises hydroxyl, carboxylic, phenolic hydroxyl, active groups. ...