When heated slowly, collagen in the skin, bones, and connective tissue of an animal breaks down into gelatin, which can then be used to set liquids into jellies. Gelatin powder is gelatin that has been dried and broken up into individual grains, which has the advantage if dispersing more easily throughout a dish.Gelatin sheets are made from gelatin that is dried in a flat sheet. Sheets result in a clearer, more transparent final product than powder.As far as we could tell from our research, gelatin sheets and gelatin leaves are just different names for the same product.hen heated slowly, collagen in the skin, bones, and connective tissue of an animal breaks down into gelatin, which can then be used to set liquids into jellies. Gelatin powder is gelatin that has been dried and broken up into individual grains, which has the advantage if dispersing more easily throughout a dish.