Uruduᵗᵘᵖᵉ

From the Sumerian 𒍏, meaning copper. Copper is used to reduce silver ions via ammonium copper citrate. It is Van Dyke's coppery cousin; the result is much brighter. The silver particles are certainly finer, and there must be some metallic copper left. I have not found any reference to this process in the literature, so I have named it: Uruduᵗᵘᵖᵉ and filed a Soleau envelope (Stéphane Corbé - 2026).