Rock Covers Paper #9
Rock Covers Paper #9
Rock Covers Paper #9

Bob Kolbrener

Rock Covers Paper #9

Sur Coast, California, 1999

Original Gelatin Silver Photograph

Pristine condition

certified authentic
Add to Collection $1,700.00
Rock Covers Paper #9
Rock Covers Paper #9
Rock Covers Paper #9



Original fiber-based Gelatin Silver photograph by Bob Kolbrener, "Rock Covers Paper #9, Carmel Highlands, California." Individually handmade by Bob Kolbrener from 8x10 sheet film with Ilford Cool Tone fiber-based photographic paper. Dry-mounted on cotton rag museum board. Signed in pencil on mount.


The HD Video of the actual work in question has been provided as a visual condition report. If you would like a written condition report in addition to the HD video, please


Working with black and white film, two medium format cameras, a large 8×10 format camera and a Zone VI enlarger, without utilizing any computers or digital technology, “Bob may well be one of the last great masters of photography’s traditional era,“ said Brian Taylor, former Director of the Center for Photographic Art in Carmel.

portrait of bob kolbrener

Visual of Bob Kolbrener spotting, or retouching, Rock Covers Paper #9.

bob kolbrener retouching photograph


The most popular black and white process of the 20th century was gelatin silver, in which the image consists of silver metal particles suspended in a gelatin layer. Gelatin silver papers are commercially manufactured by applying an emulsion of light-sensitive silver salts in gelatin to a sheet of paper coated with a layer of baryta, a white pigment mixed with gelatin. The sensitized paper, generally fiber-based, is exposed to light through a negative and then made visible in a chemical reducing solution. William Henry Fox Talbot introduced the basic chemical process in 1839, but the more complex gelatin silver process did not become the most common method of black-and-white darkroom photography until the late 1910s. Because the silver image is suspended in a gelatin emulsion that rests on a pigment-coated paper, gelatin silver can be sharply defined and highly detailed in comparison to platinum or palladium, in which the image is absorbed directly into the fibers of the paper.

Cross section of Gelatin Silver paper