||People working in tanneries have the hardest physical work I have ever seen (maybe miners can top that). The stench is almost unbearable, you struggle with nausea every second. Sometimes you are given leaves of mint to smell and ease the smell.
People are working knee-deep in tanks of liquid. Some are used to paint the leather, some are to soften it. The softening is especially gruesome since the tank is filled with thinned pigeon shit (due to its ammonia content)! That explains the smell. These guys work for almost no money at all while goods in the store are sold for stellar prices (relatively).