I think it would depend greatly on the species of snake..
I don't know much about captive behavior of anything other than Ball Pyhons but I do know that several species of Lizars will even have a go at their own reflection in a water dish.
If it's truly a 'one way' tint that means it's likely mirrored on the other side. Could be stressing the snake out more than it is now if it has to look at what it may perceive as another snake in it's territory all the time... Again totally depends on the breeds involved. I would think a light cloth over the front of the cage would work as well but not look as cool.
I'm not afraid of the Dark, I'm afraid of what's IN the Dark. ~Anonymous~
Ball Python, Leopard Geckos, Bearded Dragon, Crested Geckos, Corn snakes a Dumeril's Boa and African Dwarf Frogs so far.