iterm	Excellent grade	First grade	qualified
purity≥	99.99	99.95	99.90
moisture≤	0.01	0.01	0.020
acidity≤	0.0004	0.0004	0.0008
Residue on evaporation ≤	0.0005%	0.0005	0.0010
Chroma ≤	10	10	10

With good quality and low price