Item Index exterior yellow powder pH value (1%) 4.5-7.5 solid content,% ≥95 ash,% ≤5 heavy metal content,mg/kg ≤20 As, mg/kg ≤2 aerobic bacterial count,num/g ≤500 Package: This product is packed in the aluminum-plastic compound bag in vacuum condition 500gr, which the shelf life is two years under the sealing condition.