Injecting - IV Coke preparation issue

[calmurphy17]

a friend of swims came over theother night with 3 grams of coke that he had bought and wanted to share, and said he had had aa couple of lines and it seemed ok (it wasnt from his usual dealer or a dealer that swim knew) i had a line and all seemed fine but swim being the junkie he is suggested shooting it-swim is a experienced IV'er of everything practically but swims mate had had only shot H before-so after i sold the idea to him he was raring to go and heres the BUT...But when they added coke to water on the spoon it would not dissolve,they needed to add a little heat to make it dissolve but that left a little oily residue floating on top of the mix which puzzled swim but swim thought the filter will sort that out.when we went to shoot it we couldnt as it seemed to kinda crystallise in the syringe and block the syringe (they were 29G size by the way, maybe a little small for coke?)DOes anyone know why any of this happened?shit coke?one of the cuts in the coke?but it was ok snorted...swims ma\te was VERY dissapointed because swim had talked it up after all shooting coke IS great.thanks to any replys in advance