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Did you know you can pick from anything on the screen using the Poser color picker? You don't have to click on the stupid gradient it shows. You can keep a window open with any image, click and pick.You can sample anything - web page, images, other colors already showing in your render or in other material nodes. I do this all the time. When I want white, I click and point at something that's already white. That's the most common case. There's always a node around that has white in it.

No I didn't know that, actually. I'll have to try that. I knew about picking stuff on the screen in Poser but never even tried it on something else.
Once again, thank you, BB.

I think I should put that last line in my signature. ;-)