Fresco-secco (or a secco) is a fresco painting technique in which watercolors are applied to dry plaster that has been moistened to simulate fresh plaster. Fresco (plural either frescos or frescoes) is any of several related Painting types done on Plaster on walls or Painting (pān'tīng in Art, is the practice of applying Color to a Surface (support base such as e Watercolor ( US) or Watercolour ( UK) (and "aquarelle" in French is a Painting method The term plaster can refer to plaster of Paris Lime plaster, or Cement plaster. In true fresco (buon fresco), the plaster is still fresh and has not dried when the watercolors are introduced. Buon fresco (Italian for true fresco) is a Fresco Painting technique in which watercolors are applied to Plaster when it is still
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. But it has the advantage of being able to work indefinitely longer time or make aftertouch.