[antimatter101]

Which one of these have a green solution? Cupric citrate, cuprous citrate, cupric tatrate, or cuprous tartrate? Please let me know.

[Hunter2]

Cu(H₂O)₄²⁺ are blue. Do Cu⁺ exist with citrate or tartrate? Coppercitrate have some green colour.

[antimatter101]

Which copper citrate? Cupric or cuprous?

[Hunter2]

Cu²⁺ because Cu⁺ is not existing there. Cu⁺ exist in my opinion only as oxide, sulfide and (pseudo)halogenide.

I am not sure if citric or tatratic can complex such kind of things.

[antimatter101]

By the way, it is dark green. When more water evaporated it even looked a bit yellow.

[kaliaden]

Cupric salts can show both blue and green solutions as well especially in the presence of chloride ions due to formation of the [CuCl₄]^2- ion.

I don't think it is a cuprous salt since Cu⁺ is unstable in solution and almost all cuprous compounds are insoluble.

Again.. cupric citrate is supposed to be insoluble.
Cupric tartrate is highly soluble since the tartrate ions form a stable complex with copper. So it is most likely cupric tartrate although I'm not absolutely sure...