DL-Malic acid
Appearance: White crystal or powder, strongly sour

Content(C4H6O5): 99.0%~100.5%
Specific rotation: -0.10~ +0.10
Heavy metals: ≤ 10mg/kg
Residue on ignition: ≤ 0.1%

Fumaric acid: ≤ 1.0%
Maleic acid: ≤ 0.05%
Water-insoluble matter: ≤ 0.1%
Arsenic (as 2O3): ≤ 4mg/kg