I once heard off a mate that this causes problems. Swims coke was very high quality with clear crystal planes and previous bioassay reinforced this.
Swim followed the methods mentioned in a post about dissolving in hot methanol and slowly dripping onto a glass surface, one drop at a time, until the solvent evaporated. Swim was meticulous about this but anyway the result was a sticky mess of really strong tasting coke that never actually dried out. Even after leaving it for 2 weeks it never was dry enough to put up your beak.
good luck