Strangely enough, if you look more closely, a lot of those "non-silver processes" still involve silver. Regardless, it seems unlikely that anyone ever produced mass-market portable cameras based on any of those systems, and you need that technology to have anything approximating a paparazzi culture.
--G. and I knew someone would bring up cyanotype... :) -><- Benjamin D. Hutchins, Co-Founder, Editor-in-Chief, & Forum Mod Eyrie Productions, Unlimited http://www.eyrie-productions.com/ zgryphon at that email service Google has Ceterum censeo Carthaginem esse delendam.