scarlet red

plural scarlet reds

1. countableuncountableUsed other than figuratively or idiomatically: see scarlet, red.

   Synonyms: Biebrich red, Sudan IV

2. countableuncountableAn azo dye used to treat wounds and ulcers and as a histological stain.

   The staining may also be done in a saturated solution of scarlet red in equal parts of 70% alcohol and acetone....

   1959, Ivan Nikolaevič Filipév, Jacobus Hermanus Schuurmans Stekhoven, A Manual of Agricultural Helminthology, page 195

   1 more example

   Scarlet red is an aniline dye which has been used in the treatment of wounds and ulcers since the beginning of the past century.

   2005, Avi Shai, Howard I. Maibach, Wound Healing and Ulcers of the Skin, page 219