It was written in Dyes and their Applications by Forsythe Sickle that:
An odd concoction, universal dye was originally brewed by Cielkundl-Ost in 65ARR. Cielkundl was first to notice the odd properties of dripper juice and its ability to change colour to match common items - allowing for easier dying of fabrics. By 69ARR, all Arnthakian cloth was coloured using universal dye and has been since.
Though there was some concern that dripper mushrooms were disappearing, careful cultivation efforts by the Ost family have ensured continual supply.