"Sanguine (/ˈsæŋɡwɪn/) or red chalk is chalk of a reddish-brown colour, so called because it resembles the colour of dried blood. It has been popular for ...
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centuries for drawing (where white chalk only works on coloured paper). The word comes via French from the Italian sanguigna and originally from the Latin "sanguis"." - (en.wikipedia.org 14.09.2021)