Switching or blinking? – The switching behaviour of single photochromic triads Johannes Maier, Martti Pärs, Tina Weller, Mukundan Thelakkat and Jürgen Köhler EPJ Web Conf., 190 (2018) 04014 Published online: 26 September 2018 DOI: 10.1051/epjconf/201819004014