Heat one cup of grape juice until nearly boiling.Add gelatin and stir to dissolve.Add remaining grape juice and give it a stir.Stir in vitamin C powder.Pour into silicon molds, or a single loaf pan.Refrigerate until firm.Remove from molds.To remove from a glass or metal pan, simply slide a butter knife or spoon along the edge to loosen until you can pick it up with your fingers and pull it out.Use Scissors to cut into squares.Store in the refrigerator.Enjoy! (One at a time ;) )