[f. VERMILION sb. + -ETTE.] A substitute for or imitation of the pigment vermilion, the chief constituent of which is eosin or similar dye.

1

1897.  Allbutt’s Syst. Med., II. 989. Several of the bright red colours used as pigments … contain arsenic; for example cochineal red, Persian red, vermilionette, and rosaniline.

2

1900.  Daily News, 3 Aug., 7/5. [He] said defendants had been making vermillionette, without providing a bath.

3