Tinted with a neutral gray. This doesn't change the reflections, but does change the refractions. The increased contrast gives the impression that the reflections are stronger - they are not.

Note: Without GC it looks nothing like this. GC is mandatory if you want realism.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)