fuchsine

noun1

1. •
   A dye (rosaniline hydrochloride, C₂₀H₁₉N₃·HCl) usually a deep red or magenta colour.

   • By other experiments a much finer subdivision can be made. A solution of .00000002ᵍ of the red coloring matter, fuchsine, in 1ᶜᶜ of alcohol gives a distinct color. — 1894