Drawing Techniques: a Guide
Dry Media: Red Chalk  
Natural red chalk, often in the past called by the French term sanguine, is hematite, or iron oxide suspended in clay. Like black chalk it acquired popularity in the late fifteenth century and waned towards the end of the eighteenth. Leonardo da Vinci has been considered its first great master. Its rich red-ochre color gave it a natural preeminence for the depiction of surface contours. It became the favorite medium for nude studies in the Florentine and Bolognese academies.


  Giovanni Battista Naldini. Mercury and Aglauros. Horvitz Collection, Massachusetts.
Black Chalk
White Chalk