Technical gelatins and animal glues are derived from collagen substances contained in the bones and skins of animals. Animal adhesives are odorless, hard, dry, sometimes transparent, and can range in color from light amber to dark brown.
inseed oil is the classic, most popular medium used in oil painting. Designed to dilute too dense ink consistency, increases luminosity and colour saturation. Thanks to the use of oil in combination with paints, brush marks are brushed away, it is easier to achieve smooth transition between colours.