1. Coat a specific brand of semi-gloss photo-paper with a solution of the dye thionin acetate.
  2. To then readily convert that thionin acetate coating into the less soluble salt thionin ferricyanide.
  3. To then coat the sheet with a special photosensitizing liquid we have developed.
  4. To then expose the covered sheet to the image from a projector.
  5. To then develop the exposed sheet in acidic ferrous sulphate solution where it creates the famous Prussian Blue pigment and removes thionin dye.
Blythtype – DIY positive working Cyanotype – Full instruction video on Youtube.

Blyth, J. & Richardson, M. De Montfort University, The Gateway, Leicester, LE1 9BH

Non-holographic imaging systems