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Home > Resources > Glossary > Definitions - G > Gumoil

Gumoil

Pioneered by Karl Koenig in 1990, this photo process creates the deep atmospheric values of nineteenth century photographs. A film or digital image is converted to an enlarged black/white positive transparency. The transparency is contact printed under powerful ultra violet radiation onto heavy water color paper which has been coated with a mixture of gum Arabic and sensitizer. It is developed in running water and, when dry, rubbed all over with oil paint (usually black) and wiped off. Next the image is etched in household bleach which opens the next tonal region making it open to a second oil pigment. The final polychromatic prints are then glazed for permanence. No two gumoil renditions from the same transparency are identical although a high degree of similarity can be achieved. Each print is custom made by the artist.

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