- What is a Gum Print? link
- Tony Gonzalez's curve for three color gum C-M-Y - link (see book for workflow)
- Curve for 4 color gum (same as cyanotype - see book for workflow)
Gum over Cyanotype: link
Toning B&W Silver Gelatin Prints (see books/binder for recipes and more info)
Also read here
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