Ammonium Iron (III) Citrate - Green

Product Code :  S0003034-100G
Brand:  BRECKLAND SOLUTIONS
Assay:  98%
CAS:  1185-57-5
Index No.:  Not listed
EC No.:  214-686-6
Formula:  C₆H₈O₇ . xFe₃ . yNH₃
Synonyms:  Ammonium Ferric Citrate
Info:  Green
UN Hazard Class:  N/A
UN Number:  N/A
UN Packing Group:  NA

Q = My Ammonium iron (lll) citrate should be green but it now looks brown - is this correct?
A = Ammonium iron (lll) citrate can be reduced to ferrous salt by exposure to light. Sometimes you find that, if stored in a clear bottle, the powder on the outside (i.e. exposed to light) can turn brown whereas the rest of the powder remains a greenish colour.