Hi,
This is obvious really, when you think about it but I DIDNT!!!!!!!!
If you use bi carb of soda to make snow on your dio do yourself a favour and keep it away from bright light and heat or it will start to dissolve and disappear.
Just my luck, i wait all year for some decent weather and when it comes it starts to ruin my dio!!!!!
#:-) #:-)

Did you "seal" anyhow the bicarbinate of soda? Usually if you do not allow it to interact with external agents it doesn't change color or melts...
Ciao

Yes,
i sealed it with copious amounts of hairspray, the dio's not ruined, its something that can be fixed with a little more craft spray, baking soda and a crate of hair spray!!!!!!
#:-)

I don't have experience with hairspray... can it be the problem? I don't think it's designed to last forever so color stability shouldn't be an issue...
Ciao

Whatever you do, I would'nt spill any vinegar on it.