Courtesy of the Chicago History Museum: Chicago Board of Education - Architectural records for buildings by Schmidt, Garden & Erikson and related firms, 1993.285 Photomechanical (ink or toner on paper) Hectograph Copy (Architecture) (c. Exposure to heat and light will cause image fading.Paper likely embrittled and yellowed from residual chemicals.If on paper, verso (back) is noticeably bright white in comparison to recto (front). I Image Azo dye-based ink Identification Often seen with dirty, flecked ground and yellow discoloration especially along edges. Courtesy of Facilities & Services, UIUC, University of Illinois Board of Trustees. Oxidized image lines may yellow or exhibit silver mirroring.ĭiazo Print (Architecture) (1923 – present)ĭiazo print.Ground is usually clean and smooth, but it may be littered with tiny black flecks left from emulsion. The lines may exhibit a subtle metallic sheen. I Image Photographic silver (emulsion) Identification Positive image with strong ink-like black lines that appear to sit on the surface of the support in slight relief. Prone to silvering and yellowing, especially if not properly washed.Usually high contrast black and white images. I Image Photographic silver (emulsion) Identification More commonly found as a negative image, but positive images were also made. Sensitive to air pollutants, heat, and high humidity.Residual acid in the print may cause yellowing and weakening of support.Blue staining may be visible on verso (back). Unlike the speckled "dirty" ground of a sepia diazo, the ground of a positive VanDyke print will appear uniform and clean. Negative prints have a cool brown ground with white lines, while positive prints have a white ground with cool brown lines similar in appearance to a sepia diazo print. I Image Silver and iron Monochrome (brown/white) Identification High contrast image may be positive (final print) or negative (internegative). Very sensitive to light, otherwise relatively stable.Extremely matte surface with continuous tone and brilliant blue image. I Image Monochrome (Prussian blue pigment) Identification More commonly found as a negative image, but positive images were also made (“pellet prints”). Courtesy of the Facilities & Services, UIUC, University of Illinois Board of Trustees. Residual chemicals in the print may result in discoloration, embrittlement, scratches, scuffs, and cracks.īlueprint (c.Very sensitive to UV light, which will cause image fading.Aniline prints are rarely found in collections. Positive image is low contrast with soft lines, most commonly violet, blue, or black. I Image Aniline dye-based ink Identification Ground has a distinctive greenish or yellowish tint, with lighter-colored verso (back). Due to destructive off-gassing, should be stored separately from other formats.Īniline print.Sensitive to light, which will cause image lines to discolor, fade, or even disappear.Acidic image material may cause lacing of the support.Residual acid in the print may cause yellowing and embrittlement of support.Image lines may appear either raised or burned into the support’s surface, depending on method of production. Image lines are likely faded to brown or dull black. I Image Iron gallo-tannate pigment ink Identification Positive image on a light, probably yellowed or discolored, ground. Architectural Drawing Reproduction Cheatsheet Photoreproduction Ferro-Gallic Print (1859 – 1930s)įerro-gallic print.
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