Fresco-secco
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Fresco-secco is a painting technique in which watercolors are applied to dry plaster that has been moistened to simulate fresh plaster. In true fresco painting (buon fresco), the plaster is still fresh and has not dried when the watercolors are introduced.
Because the pigments do not become part of the wall, as in buon fresco, fresco-secco paintings are less durable. The colors may flake off the painting as time goes by.