Central Receiving Warehouse for University of Illinois Urbana Champaign Campus

Title: Central Receiving Warehouse for University of Illinois Urbana Champaign Campus
Description: The diazo print (or diazo for short) is the result of a duplication process yielding a direct positive image. A diazo is an azo dye line drawing reproduction of an original line drawing (frequently deep blue or purple, but also black or brown) on a near-white background. Fibers will be visible under low magnification. Diazos have a smooth, lightly calendered surface. The verso (back) is usually white, but it may show signs of discoloration in the form of yellow stripes. May possess an ammonia odor, which can be transmitted to other documents stored together. Sepia diazo prints (brown lines on a flecked ground) are often printed in reverse; and, they may have a waxy or oily coating. "Ozalid" brand paper, a common, patented diazotype paper, will have brown-red lines and a faint rust-colored ground; it should also show the presence of a trade name watermark.
Designer: Unknown
Date: 1923
Source: https://psap.library.illinois.edu/collection-id-guide/archdrawingrepro#diazoprint-arch
Bibliographic Citation: Courtesy of Facilities & Services, UIUC, University of Illinois Board of Trustees.

Media: Central Receiving Warehouse for University of Illinois Urbana Champaign Campus