I just had to share this... Last night I was up late applying super-blue luster dust to an entire tier. At about 3 pm today I blew my nose and my snot was the prettiest shade of blue I've ever seen! 
I almost saved the tissue to show my husband, LOL!
(Sorry that grosses you out, I just thought it was hilarious)
Yea, first time it happens it can freak you out! I never know what color I'm going to get when I blow my nose cause I work right next to the airbrush at my work and people use it all day! I was talking about it with a fellow employee one day and he wondered if it colors your lungs too, he figured a decorator could be diagnosed with rainbow lung!
I know this seems funny, but you really are probably clogging up your lungs (esp if it happens a lot, and not just once or twice in your lifetime.)
It may be a good idea to wear one of those little surgical mask thingees when you are doing things that can get fine particles into your lungs. (That includes dusting things with powdered sugar or cornstarch.)
Sorry to throw a wet blanket on things. 
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