the.com/tempering
controlled torture that makes metal and chocolate equally unbreakable in their resolve.
steel secretreheating hardened steel trades brittleness for flexible toughness
chocolate physicsforces cocoa butter into one stable crystal form
the snapproperly tempered chocolate breaks with a sharp crack
color tellssteel's heat shows as straw, bronze, then blue
swordsmith trickdifferential tempering yields hard edge, springy spine