Fluffy Puffy Stuff !
Yes - that is the actual name.
Bought this bottle of magic potion at Doncaster Craft Fair in July. You draw or, in my case, scribble a pattern on card. It looks like white ink - until you use a heat gun on it - when it magically fluffs up and turns into snow, fur, or whatever you want it to be. It is fascinating to watch and it sets firm so doesn't shed all over the place.
Made this card for my 7yr Great Nephew.