View source for Eosin

===Other uses===
[[File:Veld met irissen bij Arles - s0037V1962 - Van Gogh Museum.jpg|thumb|In his ''Field with Irises near Arles'' painting, Van Gogh incorporated red eosin dye into the color of the irises depicted at the bottom of the painting. Due to eosin's tendency to fade, the petals have now attained a blueish hue from their original purple coloration.<ref name=Dyefade />]]
Eosin is also used as a red dye in inks; however, the molecule, especially that of eosin Y, tends to degrade over time, leaving behind its bromine atoms, hence causing paint incorporating such a dye to obtain a darker brown tinge over time.<ref name=Dyefade>{{cite web|url=https://cen.acs.org/articles/94/i5/Van-Goghs-Fading-Colors-Inspire.html|title=Van Gogh's Fading Colors Inspire Scientific Inquiry |date=21 January 2025 }}</ref> A notable user of eosin dye was the [[Post-Impressionist]] painter [[Van Gogh]].