The Three Crayon Technique: A Brief History, Materials Recommendations, And Three Approaches

This in an introduction to the three crayon technique, a method of drawing that employs sanguine, black and white chalk pencils on toned paper. I provide a brief history, give my recommendations for what materials to buy, and demonstrate three approaches to working in this method.
Here are the materials I'm using. If you'd like to make your purchases through Amazon, and support my channel, please use my affiliate links.
For the first approach:
Conte sanguine pencil: amzn.to/4bJSkKf
Conte white chalk: amzn.to/3Y3Axuo
Conte Pierre Noir 3B: amzn.to/4d0z4cg
Canson white sketchbook paper: amzn.to/3zGuDFe
Faber-Castell pastels (I used yellow ochre, venetian red and grey pastels): amzn.to/461BbKM
For the second approach:
Oil-sanguine pencil by Kohinoor: amzn.to/3W4iHo9
Pitt oil-based pencil, extra-soft: amzn.to/3VYWWX3
Prismacolor white pencil: amzn.to/3Wmh8DJ
Strathmore light grey paper: amzn.to/3xS8KlV
For the third approach:
Stabylo Carbothello pencil, (color # 1400/645): amzn.to/3Y7s7Ch
Stabylo Carbothello pencil black: amzn.to/3Y7s7Ch
Stabylo Carbothello pencil, white: amzn.to/3Y7s7Ch
Paper: blue drawing paper made by Saint Armand Paper Mill (not available through Amazon)