An attempt has been made to study the state and lightfastness of three reactive dyes on normal cellophane and cellophane treated with sodium zincate solution, the dyeing being carried out by using water, water-acetone, formamide-acetone and DMSO-acetone media. All three of the dyes were found to be present in the aggregated form on both the films. The extent of aggregation as measured from y/x ratio of the spectru of dyes was found to be in the following order: water, water-acetone, formamide-acetone, DMSO-acetone. The lightfast ness of dyes as indicated by characteristic fading curves also followed the above order. The dyeing of cellophane treated with sodium zincate showed higher lightfastness, which was attributed to better dye penetration due to the elimination of skin structure. For other information on lightfastness properties, see also AATA 201750. -- AATA