Appearance

White to crystalline powder

Meliting point

128-132℃

Residue on ignition

≤0.1%

         Loss on drying

≤0.5%

Content

≥99.0%

      Specific optical rotation

-15.5^o ～­­-17.5^o

Heavy metals

≤10ppm

  Absence of   reducing substance

Blue don’t change to red

Clarity of the solution

Clear and colourless solution

Ultraviolet absorbancy degree

≤0.03%

Readily carbonizable substance

NO deeper than the orange red no.2

Nickel

≤5ppm