Molecular formula
Density	2.7g/cm3
Appearance	Dark red flake
	Internal standard
Content(CrO3 )%	≥99.85
Sulphate(SO42-)%	≤0.05
Sodium (Na)%	≤0.02
Water insolubles%	≤0.02
Turbidity%	≤3.0
Iron(Fe)	≤0.005