If you interested in this product, pls seach us by google of Hangzhou onicon chemical,or contact me by email of selenite88(a)hotmail dot com Quercetin Dihydrate CAS 6151-25-3 Appearance: Yellow fine powder Sieve analysis Characteristic:**pass 80mesh Loss on Drying ≤1.0% Residue on Ignition Bulk Density ≤0.2% 45-55g/100ml Extract Solvent Ethanol and Water Heavy Metals <10ppm As <2ppm Residual Solvents .2000 Total Plate Count <1000cfu/g Yeast and Mold <100cfu/g Negative Salmonella Negative Assay (HPLC) 95% --99% Assay (UV) 98.0% -102% Store in cool and dry place Keep away from strong light and heat 2 years when properly stored