I've always used acrylic so have not noticed this at all. The Ansel Adams print that we have is here: http://www.anseladams.com/Merced_River_Cliffs_Autumn_p/5010116-u.htm and we had the studio frame it for us. I've not noticed any color cast at all but don't know whether they use UV-protecting acrylic or what. The print looks stunning and it's a relative cheap way to have an Adams on the wall!!
That was John's point. Glass, if not Museum standard, gives a green tint and acrylic is pure transparent, with no tint.
I'm going to exhibit later this year, in Oct, and I'm leaning more and more to try with no glazing at all.
It looks a bit odd, but when getting used to it, it's feels actually more "natural" and "neutral". One really downside is that
the artwork isn't protected at all.
1. Standard glass; low cost, green tint, fragile, high weight, reflections, artwork protected
2. Acrylic; medium cost, no tint, not fragile, low weight, easily scratched, reflections, artwork protected
3. No glazing at all;..............no protection of artwork