This reminded me of a YouTube channel where a maker crafts knives out of various substances (including one made from Lignum Vitae [0]). He recently began measur

This reminded me of a YouTube channel where a maker crafts knives out of various substances (including one made from Lignum Vitae [0]). He recently began measuring the Mohs' hardness of the different knives he makes - though I'm not sure exactly at which video that starts. [0] https://www.youtube.com/watch?v=kKH63_r0OCA https://www.youtube.com/watch?v=kKH63_r0OCA