Final answer:
Conté crayons were developed in France and were initially available in only three colors: red, yellow, and blue. However, today conté crayons come in a variety of colors besides black including red and gray, as well as other hues. They were invented by Nicolas-Jacques Conté in 1795, who combined clay and graphite to create a soft waxy crayon.
Step-by-step explanation:
Conté crayons were developed in France and were initially available in only three colors: red, yellow, and blue. However, today conté crayons come in a variety of colors besides black including red and gray, as well as other hues. They were invented by Nicolas-Jacques Conté in 1795, who combined clay and graphite to create a soft waxy crayon.