General term for drawings that employ sepia as a colouring agent. Sepia, the secretion of cuttlefish, is similar to the brown tusche Biester but a bit darker and cooler in its colouring quality, sometimes fading into brown-blue hues. Sepia is mainly used with watery drawing techniques (as drawing tusche or watercolour). Due to its ability to produce transparent, monochromatic effects, Sepia was very popular at the end of the 18th and beginning of the 19th century. Its poor resistance to light gradually reduced its popularity and gave way to colouring agents derived from tar.