More synthetic dye inventions listed…

1875-76: Chrysoidine 1st type of Azo dye

1876: Methyl Blue

1877: Malachite Green

1878: Biebrich Scarlet, Pure Red (acid dye as bright as cochineal for the first time)

1878: Synthetic Indigo – marketed in 1897

1900 forward – 1 to 2 new ones introduced each year to present day

(Indigo dye today)