Ans: Fading of film coated tablets have many reasons like which colour you are using,quality of it,active materials,excipients,granulating method used with aqueous or ipa (Isopropyl alcohol) to formulate the tablets which may reacting with the colourcoats during processing the effect gives on standing,some times the Ph of the coating solution make effcet on shade of coating on stability and the effect of primary packaging material too has great role in color change. Contact the technical advisor of coating agent vendors.
So before and after stability data is necessary.