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Collotype

Collotype is a plangraphic, photo-mechanical, non-screen printing process that makes possible the faithful reproduction of half-tones and fine tonal gradations. Collotype was first used to produce printing plates by A. L. Poitevin in 1855. To make the plates for printing, a matt etched mirror-glass plate about 10 cm thick - similar to that used in screen printing - is coated with a light-sensitive emulsion (chromate gelatine), which makes it sensitive to light. The plate is exposed beneath a negative; the amount of light admitted in exposure determines the extent to which the emulsion is case-hardened (less light means less case-hardening). When the plate dries, a fine, puckered grain is left. The individual grains of this layer swell in water to varying degrees, matching the extent to which they repel the waxy collotype inks. Thus contrast can be increased in collotypes by moistening the emulsion (moistening to a greater extent lessens contrast whereas moistening to a lesser degree enhances it). Hence the necessity of uniform humidity for ensuring consistent results in collotype printing. Collotype is only suitable for small editions. It is the printing process that achieves the finest results in reproducing paintings.  


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Example of sold lots

Picasso, Pablo

Pablo Picasso - La Fille de l'artiste au bateau

Sale 380 - June 04, 11
Lot 119
Collotype print 1965
18,750 EUR / 25,874 $
sold
Details

Polke, Sigmar

Sigmar Polke - Samson und Delilah

Sale 378 - May 07, 11
Lot 264
Collotype print 1989
6,625 EUR / 9,142 $
sold
Details

Rauch, Neo

Neo Rauch - Werkstatt (Tief)

Sale 396 - Oct. 20, 12
Lot 1028
Collotype print 1995
5,625 EUR / 7,762 $
sold
Details

Hamilton, R.

Richard Hamilton - Interior with monochromes

Sale 390 - April 28, 12
Lot 869
Collotype print 1979
4,750 EUR / 6,554 $
sold
Details

Rauch, Neo

Neo Rauch - Lage

Sale 365 - April 24, 10
Lot 948
Collotype print 1994
2,806 EUR / 3,872 $
sold
Details

Braque, Georges

Georges Braque - La barque

Sale 383 - Oct. 28, 11
Lot 461
Collotype print 1950
2,250 EUR / 3,104 $
sold
Details

Berber, Mersad

Mersad Berber - Flora

Sale 372 - Oct. 23, 10
Lot 525
Collotype print 1990
1,830 EUR / 2,525 $
sold
Details

Vlaminck

Maurice de Vlaminck - Après l'Orage (près de Pontoise)

Sale 395 - Oct. 19, 12
Lot 294
Collotype print 1950
1,750 EUR / 2,415 $
sold
Details

Christo

Maurice de Christo - Wrapped Sylvette, Project for Washington Square Village, New York

Sale 347 - Oct. 24/25., 08
Lot 685
Collotype print 1973
1,220 EUR / 1,683 $
sold
Details in German

Beuys, Joseph

Joseph Beuys - Ohne Titel [Filzblöcke]

Sale 378 - May 07, 11
Lot 34
Collotype print 1977
875 EUR / 1,207 $
sold
Details in German