from the Crayola Crayon Chronology (YCLIU), submitted without comment:

Prussian Blue - name changed to "midnight blue" in 1958 in response to teachers' requests

flesh - name voluntarily changed to "peach" in 1962, partially as a result of the U. S. Civil Rights Movement.

Indian Red - renamed Chestnut in 1999 because of educators who felt some children wrongly perceived the crayon color was intended to represent the skin color of Native Americans. The name originally was from a reddish-brown pigment found near India commonly used in fine artist oil paint.

24 new colors added in 1998, including "Pig Pink"...