This is an antique used F. W. Devoe & Co. white ceramic or porcelain 6 position paint palette that could be used for oil, acrylic, or watercolor paint. The piece is about 8" by 3" by 3/8" and it looks like a slab.
Antique watercolor paint blocks Palletts & supplies for sale
vintage watercolor palette, 公認海外通販サイト
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FABUNESS Porcelain Watercolor Palette, 2 Stackable Ceramic Artist Paint Palette, Watercolor Mixing Tray for Watercolor Gouache Painting, 10 by 4.7 Inch, Rectangle
F. W. Devoe & Co New York Antique Ceramic Porcelain Watercolor Palette 8 x 3
Antique watercolor paint blocks & makers
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Catalog - Important May Estates Auction: Session I