From Marion Boddy-Evans,
Your Guide to Painting.
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Often, I have oil paint left on my palette after a painting session. More importantly, I have colours I have blended for the painting I am working on. I have tried many way of preserving these. I have used glass palette and simply submerged them in a tray of water. This works overnight quite well. Another way I have come up with to preserve a palette is to use wax paper over my wood pallete, or waxy disposable palettes. I simply cover them with either another piece of waxed paper or another disposible palette, and freeze them. This will keep the palette longer. I have never had any trouble with the paint after it has thawed out. It doesn't seem to effect the paintings either, as I have done this for many, many year, and have never had any trouble with any of the paintings.
Tip from: Susan Tschantz.

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