"A panel painting is a painting made on a flat panel made of wood, either a single piece, or a number of pieces joined together. Until ...
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canvas became the more popular support medium in the 16th century, it was the normal form of support for a painting not on a wall (fresco) or vellum, which was used for miniatures in illuminated manuscripts and paintings for the framing." - (en.wikipedia.org 17.10.2019)
