Can produce a soluble chain extended gelatin having a high molecular weight and a viscosity substantially greater than that of the normal gelatin at a concentration equivalent of gelatin and a curing time substantially shortened by preparing a gelatin composition containing 6 to 18% by dry weight approximately of gelatin, as well as 0.25 to 5 millimoles approximately a bis (vinylsulfonyl) per 100 grams of gelatin, and heating the composition at a temperature ranging from about 40 to about 60 ° C and at a pH between 4.5 and about 7 for a period of from one to eight hours.
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