(57) Impregnating agents are disclosed which can be coated on paper and then be heat transferred with conventional heat transfer printing equipment on silk fabric which obtains thereby an affinity for the dyestuffs known from heat transfer printing of polyester.

Yellowing of the silk fabrik is reduced by the addition to the coating of an optical brightening agent of the type normally used for polyester.

With these impregnating agents, easily migrating dyestuffs can be used which are transferred to the fabric at relatively low temperatures.

These techniques produce deep and brilliant shades; the prints have excellent fastnesses.