czanderson4ja13

Casein Printing

written by: Christina Z. Anderson

Casein is a colloid derived from milk. For those already versed in gum printing, casein printing is done much the same way: a colloid is mixed with a light-sensitive dichromate and watercolor, brushed onto paper and exposed under a negative to UV light. Where the light hits the most, the casein hardens the most. Where the light hits the least, the casein and pigment wash away in a simple water bath, and thus an image emerges. For each print, this exposure and development process is done multiple times, particularly for a tricolor print, which will require a red, yellow and Read more »

00736

Wilson Bentley’s Snow Crystals

written by: Christina Z. Anderson

“Under the microscope, I found that snowflakes were miracles of beauty; and it seemed a shame that this beauty should not be seen and appreciated by others. Every crystal was a masterpiece of design and no one design was ever repeated. When a snowflake melted, that design was forever lost. Just that much beauty was gone, without leaving any record behind.” Wilson Bentley, 1925 Over a century ago a nineteen-year-old Vermont farm boy named Wilson Alwyn Bentley began a 46-year love affair with the typology of snow crystals. A century after Bentley, I began a love affair with the historic Read more »

czanderson1

Chromoskedasic Printing Revisited

written by: Christina Z. Anderson

A decade ago there was an intriguing article in PHOTO Techniques magazine entitled “Silver Mirror Printing and other Unusual Black and White Print Development Processes” (William Jolly, pp. 32-36, Jan/Feb 1999; also “Silver Mirror Printing Update,” p. 11, July/Aug 1999). The process looked fasci- nating. A freshly developed, but not yet fixed, black and white print is subjected to two mild photographic solutions, an activator and a stabilizer, in the darkroom and out under room light. The activator is a dilute potassium hydroxide; the stabilizer is an acetate buffered thiocyanate. Colors appear where there is white in the print: orange, brown, yellow, Read more »