Good Morning JuliusH,
I had to sleep on it to go back and find this:
Lots of information and youtube, show and tells, on this topic.
The thing about both S.Abbadessa and GaryG of the charcoal Simplifier is they are both now College Professors. Both educated, degreed and with the actual real world doing-it, useing-it experiences for peer acceptance.
So they were able to carve off all of the froo-froo, woo-woo’s from their systems and simplify down to just the use-it, practical’s.
Enjoy the reading
Steve unruh