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Ok like seriously guys these are so cool!! And now I am on the search for a permanent product that can give this effect LOL. I’ve found 1 so far but their shipping is insane. You can pick up your own pack of these Crayola Crystal Effects Window Markers at Amazon.
I messaged Crayola to ask if there was some way to seal this and keep the effect and they said, “unfortunately there is not”. I will keep you updated when I find the cheapest product to give this effect and keep permanent because DANG this will make our Christmas crafts AMAZING.