Sheets of glass, plastic, or metal inscribed with grids whose lines or dots diffract any light directed at the gridded surface and break this light up into its color spectra so that the rays may be measured accurately.
Japanese for 'pictures of the floating world'. Ukiyo-e were popular in the seventeenth to nineteenth-centuries, and depicted kabuki actors, landscapes, and folk tales.
Example: Kitagawa Utamaro's Five Kinds of Ink from the Northern Provinces, early 1790's
Blue pigment originally made from ground lapis lazuli. French ultramarine is an artificial substitute.
Carving to create an overhang; a recess or awkward angle in the surface or form of a three-dimensional object which would prevent easy removal of a cast from a mold. Molds should be designed to eliminate this problem. Ways to cast objects with overhangs include using piece molds and waste molds.
Drawing preliminary to other work, and incorporated into it, thus deprived of independent artistic value. An example is the underdrawing in fresco and panel painting, such as sinopia and abbozzo.
The layer or layers of color on a painting surface applied before the overpainting, or final coat. There are many types of underpainting. One type is an all-over tinting of a white ground. Another is a blocked out image in diluted oil colors that serves as a guide for the painter while developing the composition and color effects.
sinopia (or sinopie),