Reason: Exploiting - Failure to report. Time/Date: 10/12/2011 Duration: Until satisfactory appeal. Proof: From: http://pawncraft.co.uk/xf/threads/b-funkydiddykong-equizio.5607/page-2
I don't think alchemy items were ever mentioned in the ban section. Therefore, you'd have to have had prior knowledge to know about those items.