Rhodiotype
The Rhodiotype is a photographic process invented by American photographer and printmaker Richard Eugene Puckett in 2016. Named from the word rhodium, which is one of the noble metals, the process uses a solution of rhodium chloride hydrate, mixed with a light-sensitive iron-based compound, to print out continuous tone photographic images on paper, fabric, wood, clay or other substrates.
Puckett's rhodiotype involves mixing a small volume of palladium chloride hydrate with a larger volume of rhodium chloride hydrate. The metals solution is then mixed with ammonium ferric ferrous oxalate and that is brushed onto the desired substrate, usually paper, and allowed to dry before exposing it to sunlight or UV light in contact with a photographic negative. A continuous-tone, gray scale photographic image prints out fully.[1]
The process is subtractive; after the image is printed out, most if not all of the palladium is removed from it. To do so, the print is immersed in a bath of hydrochloric acid having a solution strength of greater than 0.5%. The acid dissolves the finely divided palladium particles[2] that triggered the reduction of the rhodium to form the image. Hydrochloric acid does not dissolve rhodium [3]. Puckett confirmed on his website that an image 75% rhodium and 25% palladium can be printed out fully without dissolving any of the palladium.
In the documentary, "Magic Iron Rose"[4], which was awarded a Remi at the 2017 Worldfest Houston International film festival, Puckett declared that he had previously printed out, in August 2014, a 4" by 5" contact print in pure rhodium. He claimed that when he attempted to reproduce that formula, on camera, in 2016, to his surprise it failed. He worked out a new formula for printing with rhodium with his video camera recording his experiments.
References[edit]
- ↑ Rhodiotype Formula on Puckett's website, http://www.texaschrysotype.com
- ↑ Hammond, C. R. "The Elements". Handbook of Chemistry and Physics (PDF) (81st ed.). CRC press. ISBN 0-8493-0485-7. Search this book on
- ↑ Hammond, C. R. "The Elements". Handbook of Chemistry and Physics (PDF) (81st ed.). CRC press. ISBN 0-8493-0485-7. Search this book on
- ↑ Puckett's documentary about discovering a formula for printing rhodium
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