meh. I watched a you tube review on hair chalk. The chalk used just needed to be slightly damp (don't know if other type of chalks need hair spray to stay). and from the review I gathered that the chalk itself is relatively harmless. But what would cause damage is the lil clip thing you use to applicate as hair can get caught or pulled on it. well here is the review I saw:
http://www.youtube.com/watch?v=WKX0Yu8FTf8
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