The Evolution of quenching oil for blacksmithing
https://spark-wiki.win/index.php?title=The_types_of_blacksmithing_hammers_and_their_uses_Case_Study_You'll_Never_Forget
Blacksmithing is one of the few trades, if any; where the artisan can make the basic tools he requires using the very same blacksmithing process for which he will be using the tools. Indeed, for many years, a blacksmith