Cyanotypes - somewhat contrasty
Van Dyke - more tonal range + can be toned (selenium toner is the most common)
Gum Bichromate - painterly look (no sharpness per say). Can be printed with 4 colors
Platinotype - very achival, very expensive, superior tonal range
Palladium - somewhat less expensive, warmer
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Sizing Paper
All paper must be sized (except for the very thin Japanese rice paper). Arches Platine is pre-sized. However, other 100% rag paper, like Arches and/or Rives BFK, can be sized with one of three methods:
1. Use Spray Starch - at least three coats in different directions (bad option health wise)
2. Use Elmer's Glue solution (1part of glue to 2 parts of warm water). Leave in a bath for 10-15 minutes (less toxic solution)
3. Use Knox gelatin (28 g to 1 quart of water). Leave it in a bath for 10 - 15 minutes. The most thorough way of sizing.
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Printing Digital Negatives ("Making Digital Negatives for Contact Printing" by Dan Burkholder is The Book)
1. Desaturate Image
2. Drop it into the provide it template. Make sure "Cyanotype" is selected and visible.
3. Decide as to whether or not the brush stroke border is desirable and pick an appropriate layer
4. Send it to print. Chose the highest setting for Glossy paper is Film setting is absent
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Maintaining the right proportion between cyanotype solution and citric acid is of importance since it helps to clear out highlights.
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Coat as much paper as you would be able to use within 2 hours
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If - when being coated - the color turns to be green or dark blue, throw the paper away. The desirable color would be pale yellowish-greenish.
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When exposing paper, aim for highlights to be darker that what you want them to be on a final print
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