AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Photo negative slide vbook2/3/2024 Common Size(s) Lantern slide: 3¼" × 4" 3¼" × 3¼" 3½" × 3¼" Stereograph slide: 3½" × 7" Background B&W slides on glass were produced from 1850 to the 1950s, but their use persisted for decades thereafter. Regardless of the binder, care should be taken to maintain stable relative humidity so to prevent weakening of the emulsion. ![]() Collodion is more stable than gelatin but is susceptible to image-eliminating abrasion. Gelatin emulsions on glass are known to flake and delaminate due to factors both manageable (environmental) and not (manufacture). As with all glass plates, these slides are delicate and can be severely damaged through cracking and breakage. Gelatin slides are prone to delamination of the image layer. Acidic environments and enclosures spur these forms of oxidative deterioration along. Without glass cover, the slide is at a higher risk of delamination, flaking, fading, yellowing, and silver mirroring. Composition Supportĭeterioration Since most glass slides are protected by a glass cover, they are often in decent condition, despite having the same elemental instability of either a silver gelatin, collodion, or albumen negative on glass. ![]() Hand-colored images can be identified by their saturated, unnaturally bold colors, and sometimes selective coloring. Hand-coloring was an additive color method: the manual application of water colors, paints, or aniline dyes to the image surface. Many B&W slides were "color-enhanced," making them appear at first glance to be color slides. Glass slides may be hand-colored, tinted, or toned. Stereograph slides are rectangular and feature two nearly identical images side-by-side in contrast, lantern slides vary in size but are often nearly square and contain one image. Stereograph slides were given a glass cover only if they were made with an albumen binder. ![]() Lantern slides often have a glass cover in addition to its glass support, and they are sealed along the edges with strips of black tape. A glass slide will likely be a positive image, which sets it apart from a glass plate negative. 1960 Image Tone Monochrome (gray-black, warm brown, ocher orange to olive green ) hand-coloring or tinting possible Description A black-and-white glass slide is comprised of a thin glass support with an albumen, collodion, or gelatin binder, and a silver image. Although slides will often be discovered in a cardboard container like this, it is inadvisable for long-term storage.ĭates 1850 – c. Courtesy of Landscape Architecture, UIUC, University of Illinois Board of Trustees. Courtesy of Landscape Architecture, UIUC, University of Illinois Board of Trustees.īroken slide held in place by black tape seal.
0 Comments
Read More
Leave a Reply. |