The monochrome colours of sanguine and sepia can be found in life drawing classes at almost every art school. Enhanced with white, and with the shadows deepened with black, they lend vitality, liveliness and expression to the drawings. This old tradition of figure drawing dates back to the Renaissance. Faber-Castell's PITT monochrome crayons hark back to this long tradition of figure drawing, which is why the crayons designed for sketching are harder than conventional pastel crayons. For this reason, the lines do not disappear completely when smudged. The sanguine and sepia crayons are supplemented by oil-free and oil-based drawing pencils for sketching details and lines.