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Like silica in makeup. It's main purpose is to help keep your skin dry and remove excess moisture (the same way you find silica gel bags when you buy certain products) and the attendant tried to tell me it was used in some other way. It's my own personal preference but I don't -
Oh and while I'm here, silica also causes flashback in photos, so if you're wondering what caused these.. It's a silica based powder that isn't visible without flash photography! 
pic.twitter.com/47aiK6zBEH
Thanks for the info!
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