As an aside to the last post about the 1983 Chicago CTA map, Dennis also sent along this fun little “How It’s Made” video about the process used to create signs such as this. In the case of the CTA signs, the background blue would be the second layer applied to the steel signboard, and white and black would be the two screen printed colours that are then fired and fused permanently to the backing. […]
Submitted by 🔸澳洲幸运10冠军定位计划resident repository of Chicago transit map knowledge, Dennis McClendon, who says: This map of Chicago’s rapid transit network originated in the 1970s (this one is from June 1983), and this style was used until routes received color names in 1993. Happily, by that time digital printing in fiberglass-embedded signs made full-color maps easier to place in graffiti-prone environments. These maps were silk-screened onto [blue] color blanks, and every color of ink added […]
