![]() Another unusual characteristic is its regenerative ability. The chemicals used in developing cyanotypes are sensitive to alkali environments and should not be matted and framed using chemically buffered materials which could accelerate their fading. It was a simple and economical way to duplicate large-scale copies for projects. So generally avoid heat, UV light and the solvents in spray adhesives.Ĭyanotypes, also called cyan-blue prints, are a photographic process popular for engineering diagrams well into the 20th century. They are colored by ferric ferrocynaide which is known to be fairly stable in light and air but additional UV protection is always desirable. Later processes used other photosensitive ferric compounds which evolved into the cyanotype, still producing a blue background and became known as blueprints.īlueprints are sensitive to the presence of alkalinity and the blue eventually turns brown when alkaline materials are used. The result was a copy of the original image-usually of a technical drawing, elevation or diagram-with the background tinted dark blue and the image as a whiteline reproduction. Paschke, CPF GCF "Blueprints Then and Now" August 2011Ī French chemist, Alphonse Louis Poitevin, discovered in 1861 that images could be reproduced from translucent documents by exposing ferro-gallate coated paper to UV light to develop a stable blue or black dye to emerge. I try for valid XHTML 1.0 Strict and CSS.Chris Paschke - Blueprints Then and Now Paschke Online Designs Ink Publishing Article Archive and Reference Library Articles by Chris A. Mark Gutierrez on Instructables outlines how duplicate a photograph by contact printing onto Diazo paper.Ĭreated by and © 2013 Mark Fickett except where noted.Killbox on flickr experiments with blueprint paper in pinhole cameras (many with sun trails from multi-day exposures).It makes roughly letter-size exposures of good quality, like the below. To make larger prints, and in the spirit of experimentation, I made a cardboard-box camera using a magnifying filter. A few seconds of exposure to indoor lighting doesn't seem to damage the images.) Box Camera (Below, the exposed, white areas of the image are faintly visible on the paper. I taped a cardboard shelf into a cookie tub I set the exposed paper on the shelf, closed the tin, and put something opaque over it to prevent further exposure and after about 20 minutes it's ready. The paper develops when exposed to ammonia gas Windex is a sufficient source. (The back presses tightly enough against the shutter housing to hold the paper in place.) I cut rectangles from part of one of the 18"x24" sheets, and set them into the camera. The Diazo paper is yellow when undeveloped (rectangle on camera), and the unexposed areas become dark blue when developed (top rectangle). (Thus the name "whiteprints" for Diazo paper: blue lines on a white ground, as opposed to the white lines on a blue ground for "blueprints".)įor the above images, I used my 35mm film camera, and an f2 lens. The developed paper produces a positive image, although it is flipped. Overcast/snowy weather, through an office window. I took a number of exposures with small pices of paper in my 35mm film camera. Geoff set up these exposures:īoth of them took about an hour, under overcast but bright conditions.īelow, the camera used to make the exposures. 4x5 Photosĭavid Rochberg, another co-worker, lent us his Crown Graphic (a 4x5 camera, so named for the 4" x 5" negatives). It is sensitive to UV light, and can be developed with ammonia fumes (as from Windex). My co-worker Geoff Borggard bought Diazo paper (also called "whiteprint" paper, similar to blueprint paper), for experimental photography.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |