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)