ABOUT DRY PLATE NEGATIVES When photographing In the field silver gelatin dry plate negative process can be more practical than the wet collodion process. Emulsion is poured on the glass plate and dried before taking it out in the field. The blue-sensitive emulsion gives the unique feel of 19th century photographs. They are also more sensitive to (more…)
ABOUT CYANOTYPE This process requires no other chemicals, can be exposited in sunlight and developed simply in water. Cyanotypes provide a beautiful image in stable Prussian blue pigment. The image colour may be easily modified by a variety of toning agents. THE CANOTYPE HISTORY Sir John Herschel’s traditional cyanotype process, now practiced for 166 years, (more…)
ABOUT NEW CYANOTYPE This process provides an image in stable Prussian blue pigment, from a ‘single-bottle’ sensitizer solution having a long shelf life. Requiring only a short UV exposure, it yields a superbly graduated tonal scale, on a matte paper surface, having a maximum density verging on black. The image (more…)
ABOUT CARBON PRINTING The carbon printing process uses colour pigments producing one of the the most permanent coloured photographs. The use of pigment allows any colour photograph on almost any surface. The beautiful tonal scale resolves fine detail. It relies upon the ability of sensitized gelatin when exposed to U V light becoming insoluble in (more…)
Four Colour Carbon Transfer Printing ABOUT THE CARBON PROCESS The carbon process, initially a black-and-white process using lampblack (carbon black), was invented by Alphonse Poitevin in 1855. The process was later adapted to color, through the use of pigments, by Louis Arthur Ducos du Hauron in 1868. Carbon photographs were the preferred process of the (more…)
ABOUT PLATINIUM/PALLADIUM PRINTING AND GUM BICHROMATE: Printing in platinum and palladium is acknowledged as the summit of alternative processes – images formed in totally permanent ‘noble’ metal. Gum bichromate printing over palladium or platinum photographs is an effective method of using colour to built depth to enrich shadow areas. The (more…)
ABOUT THE OROTONE PROCESS An orotone photograph is created by printing from a negative to create a positive on a glass plate precoated with a silver gelatin emulsion or carbon transfer process. Following exposure and development, the back of the plate is coated with gold-colored pigment creating a (more…)
ABOUT DRY PLATE NEGATIVES When photographing In the field silver gelatin dry plate negative process can be more practical than the wet collodion process. Emulsion is poured on the glass plate and dried before taking it out in the field. The blue-sensitive emulsion gives the unique feel of 19th century photographs. They are also more sensitive to (more…)
ABOUT AMBROTYPES Ambrotypes are under exposed negatives that appear as positive photograph. The black or clear glass plate is coated with collodion with added salts, light sensitivity is created by “dipping” coated plate into silver nitrate bath. The plate is exposed in camera and processed in a darkroom before the plate is dry. Each photograph is unique – “one (more…)
HISTORY OF INFRARED Radiation outside the visible spectrum was discovered in 1800 by Sir William Herschel. The infrared spectrum is from 700nm to 1200nm know as NIR (near infrared). The 1st infrared films were made in 1930. Infrared captures the invisible world beyond human vision. Digital (more…)
