tone or colour cross contour drawing - uses lines drawn across surfaces to suggest their depth and form tonal study - uses different techniques that show light and shade, for example by blending ...

tone or colour cross contour drawing - uses lines drawn across surfaces to suggest their depth and form tonal study - uses different techniques that show light and shade, for example by blending ...

Both types of objects were widely sold individually or in sets of drawing instruments from the 17th through the 20th centuries. Instrument makers, such as Nicolas Bion in the 18th century and William ...