Paris, France around the time of the French Revolution was an absolute mess in terms of sanitation. Over 500,000 people were crammed into an area of 28 square kilometres. One of the largest contributors to pollution doing this day was the work of tanneries, which converted what is essentially animal skin, into leather goods. First the hide was immersed in an alkaline lime and water solution for up to 3 weeks, then it was brought out and shaved for both the hair on one side of the hide and the di...
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