Pebeo paints for heliographic printing (or Sun printing), and the chemicals (Potassium Ferricyanide and Ferric Ammonium Citrate) for creating blue-prints on fabric and paper with the cyanotype techniques. See also Jacquard Dye-na-flow paints which can also be used for heliographic printing.
For sun printing, the paint is applied to the fabric or paper and a mask (such as a leaf or a key) is placed over the treated material. The item is then left in the sunlight and the area covered by the mask is 'bleached' out. Cyanotype printing is slightly different in that the fabric is first treated with a solution of the chemicals and dried in the dark. A mask is placed on the prepared fabric which is then exposed to sunlight or UV light. The blue colour emerges and the covered area remains undyed. The unexposed chemicals are then rinsed from the fabric.
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