I am in the fireworks business, sometimes I set the "sniffers" off, sometimes I don't, doesn't seem to be related to the amount of "exposure" I have had, but does seem certain airports pick it up more. As they search my bag, they find my business cards, and that usually ends the problem for me. I plan on it and pack accordingly, so that there isn't much for them to go through. I always plan on extra time too. Just part of the biz for me. For the rest of you, unless you are up close and personal with the display, I don't think there will be enough residue to cause any problems, just shower and wash your clothes as normal.