Argyro-Cyanotype

We combine the cyanotype and Van Dyke methods: The process is still experimental, but it is almost certain that silver ferricyanide (orange), silver ferrocyanide (white) and iron ferrocyanide (blue) are formed. If fixed with thiosulphate, the silver ferricyanide disappears, leaving only the ferrocyanides (hence the pale blue image). I have not found any reference to this process in the literature, so I have named it: Cyano-Van Dyke and filed a Soleau envelope (Stéphane Corbé - 2026).