Identity..............................................................................................IR p/t.

l of max. ABS in NaOH 0,1 mol/l........................................... 572-575 nm

A 1%, 1cm, lmax.............................................................................>1250

T.L.C..................................................................................................... p/t.

MAX. IMPURITIES

pH transition interval:

yellow....................................................................................................4,6

purple....................................................................................................7,0

Insoluble matter in C2H5OH.................................................................. p/t.

Loss on drying at 135°C......................................................................8 %

Residue on ignition (as SO4)............................................................. 0,5 %