Indeed. Like the entire bible.
Is it heat treatment via oil and different temper stages you mean? Which would make commercial manufacturing costly because of the time each batch would take?
On a side note, I was asking; like an idiot, to get simplified answers because I am just a welder and sculptor; have made two knives so far. One out of re-bar (which looks awesome but has no strength whatsoever) and one out of spring steel which I effed up and haven't bothered with finishing it. I am really into blacksmithing and very fascinated with it, being an Xth generation of blacksmiths (most farmers in Iceland had some manner of blacksmithing in the routine) but I can't afford power hammers and my elbows can't hammer for shit, so I'll stay with sculpting steel with files and angle grinders for now.
I do enjoy reading on here while resting away from Alec Steele's experiments (for instance) on youtube. Thank you for your answers.