I know the glass you are thinking of were it is a mirror on the outside. But this is car window tint and i don't think it would be like a mirror on the one side but i have not tried it so you could be right. I will try it on a small chunk of glass to see what it is like very good point thanks.
And the snakes i would use this for would be Retics.
NEW LINE REPTILE
Specializing in Large Pythons
Home of the "GIANTS"