crayon

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crayon

a soft color-marking material used in identification especially in sheep.

crayon-marking
marking of ewes by rams wearing crayons on their chests and held there by a harness. By changing the color of the crayon it is possible to date the reproductive events of the flock. See also tupping crayon.
References in periodicals archive ?
Last week, they were still editing news copy and quotes on reel-to-reel tape, listening for the correct points to make cuts which were marked up in chinagraph pencil and sliced with a razor blade.
on to the steel sheet and trace around the outside with a Chinagraph pencil (available from all good art shops).