100 MG sachets (1000 / BOX) - The smallest amount of ascorbic acid is used to dissolve the drug in order to keep vein damage to a minimum. In a stericup or ‘cooker’, the drug is combined with sterile water. Small amounts of vitamin C are added until the drug is fully dissolved. For crack, the amount of vitamin C required is about ¼ the size of the rock; however for crack and brown or black tar heroin, the amount of vitamin C needed to fully dissolve the drug varies with the purity of the drug. Heroin may be heated until the drug is fully dissolved. Crack may also be heated, but should not be boiled. Once the packet of vitamin C is opened, any left over should be thrown away, so that it does not become contaminated and cause an infection.