Ngaire, I use a wood palette made by Lee Boynton. I keep mine clean, some of my fellow students have let theirs become grey or reddish brown by just smearing the paint around on it at the end of the day. I really have no reason for keeping mine clean except that I'm kind of a neat freak and I like it that way. It seems to me that you'll get used to whatever you choose to use. I had to use a cheap, heavy, lighter colored palette the other day and it made me realize how much I depend on the color of my good one.
About using white under glass, I think it depends on how you paint. If you tone or do a lay-in immediately, you no longer have a reason to have a white palette because you're not working on a white surface.
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