you should contact bostick and sullivan or photographer's formulary to get the chemcials tht you need by post. they do it all the time. good luck. jill In a message dated 10/25/00 7:31:27 AM, ward@kasnet.com writes: << Dear List, > >I need to test some Ferric Oxalate, but instead of Potassium Ferricyanide, >I am only able to purchase Potassium Ferrocyanide. >Will this work.? > >Thanks in advance. > >Cecil. >>