The British government of the time didn’t ban any of the paints made with dangerous metal pigments, but they did ban Indian yellow, which was made with natural organic ingredients and was not a hazard to artists.
The paint had been developed in the 1750s and became a staple of many palettes for its rich yellow hue.
To get the deep color, the manufacturers fed mangoes to cows, collected their urine, evaporated it into a concentrate, and extracted its calcium and magnesium salts.
Officials decided that it was inhumane to feed large quantities of mangoes to cows, and so banned Indian yellow.
It wasn’t until more than a half century later that paints safer for humans began replacing the more dangerous pigments.
Cynics can find in this timeline the relative value of an artist to a cow, as held by the British government more than a century ago.