Alfonso de Castro, a Spanish professor shows argyrotypes, vandykes platinum & palladiums and a range of different processes in his gallery. From: Spain. Shows: Argyrotypes, Cyanotypes, Platinum and Palladium and Vandykes. Alfonso de Castro lives in Spain and is a professor at the University of Barcelona, where he has been teaching photography for many years. He is also naturally a photographer himself. Alfonso de Castro is especially interested in portraits, … Continue reading Alfonso de Castro