... 1.Black powder 2.Water soluble 3. Alginic Acid=8-15% Natural Seaweed Extract Powder, 100% water soluble, organic fertilizer China ... Black or brown flake, water soluble, pH=8-10Main ingredient: Alginic Acid: 8-15%, organic matter≥50%, N≥0.5%, ... of Analysis:ITEMSRESULTSAppearanceBlack or dark brown flakeOdorSmell of SeaweedSolubility in water100%PH9.04Organic matter57.17%Maximun moisture7.8%Alginic ...