What technique involves applying water-based pigments to wet plaster?

The technique that involves applying water-based pigments to wet plaster is known as fresco. This method allows artists to paint on freshly laid plaster, which becomes an integral part of the wall as it dries. The pigments bond with the plaster, creating a durable and vibrant work of art. Frescoes are often characterized by their bright colors and ability to withstand the test of time, as seen in many ancient Roman structures.

In contrast, dipinti refers to a technique where paint is applied to a dry plaster surface, which does not create the same lasting effects as fresco. Encaustic involves mixing pigments with hot wax, a completely different medium and application method. Mosaic consists of creating images using small pieces of colored glass, stone, or other materials to form a pattern or picture, rather than using paint on plaster. Thus, fresco is distinctly recognized for its unique combination of wet plaster and water-based pigments applied in a timely manner.