What is the origin of vermilion?

Vermilion “brilliant scarlet red (color; pigment),” comes from Middle English vermil(i)oun, vermilion(e) (there are nearly 20 spelling variants) “cinnabar, red dye,” from Anglo-French vermeilloun, vermiloun, from Old French verm(e)illon, vermillon “red lead, rouge, cinnabar.” The Old French forms are derivatives of vermeil, vermail, from Late Latin vermiculus “grub, scarlet worm (a cochineal insect that is the source of red dye), scarlet color,” a diminutive of vermis “worm.” Vermilion entered English in the late 13th century.