Catharism

It is about an application color of the Tirage to coal invented by Alphonse Louis Poitevin in 1855. It was developed by Pierre Fresson in 1952, starting from the techniques developed by his father for pullings Monochrome S.

This method, only carried out on order by the Fresson workshop in the area Paris ienne, begins with a decomposition of the colors of the image by pulling contact on plane films black and white, with a filtering RVB which allow the successive selection of each of the three complementary colors, and incidentally of the blacks.

Each film plan then is drawn by enlarging on a Papier cartoline emulsified with a layer from Pigment S sensitized beforehand, in the following order:

  1. pigments Cyan for the film plan selected under red filter

  2. pigments Yellow for the film plan selected under blue filter
  3. pigments magenta for the film plan selected under green filter
  4. pigments Black for the film plan selected under dense filter yellow-green

Between each pulling, paper is stripped then dried, then the pigments of the following color are laid down and emulsified.

At the end of this series of four pullings, one obtains a color photograph quadrichrome CMJN (Black Yellow Magenta Cyan), the colors being obtained by subtractive Synthèse of the colors. This process is close in its approach to the methods of quadrichromes impression of the world of the edition, or the color impression in numerical Photographie. The essential difference is that a succession of pullings replaces inking.

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