HMMMMMM, I've blown through 10-12lbs of .015 Grape and almost 18lbs of .035 Grape from the same place, plenty of smoke colours without a single bleeding issue.
These aren't the best images available out there but the best I could really do. the first 2 are a dark smoke with .015 and .035 Grape and the 3rd is a light smoke with .015 Grape. Like I said, I use a lot of this particular glitter and have yet to have an issue with it bleeding. (.015 Gold is another that I have found will bleed, most notably in smoke colours giving it a green tint and Spike-It's Golds have been very stable in that regard)