I haven't tested this, just passing a word along. So don't think this has to work.
This guy who works at a pet store around here always feeds his monitor over a white plate and he only puts the white plate in to feed it. He doesn't even put the food on the plate. He puts it in and tong feeds over it. He says it works.
I don't know about monitors' sight enough to say if you could use another color or even that they can for sure tell a white plate from the rest of the stuff, but they sure seem to have pretty good eye sight. They seem to see what is going on and react to it quite effectively.

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