Simple formation of metal mirrors 

Yes! The color change from blue to metallic copper is very beautiful

Thank you 🙏

I think this might be possible in an inert atmosphere. I tried using this experiment (in air) to coat the bottom of a glass beaker, but the copper formate kept bursting into flame. It would also sometimes form a black colored product

@@TommyTechnetium Good to know, thank you very much!

hey could you make a simple extension to the experiment, put a small object, like say plastic or resin object, 3d printed, or a ceramic stone, inside the reaction tube, objective is to make a thick, possibly selectively surfaced object in the process

does the mirror exfoliate away easily, sulfate substitute reaction coating will exfoliate nicely, like copper from cuso4/h2so4 water solution reaction on top of zinc metal

Good question. I imagine one would need to heat from below. I'd also guess you'd want to limit contact between the reacting compounds and air. I tried some of the experiments you see here in an open beaker (diameter about 4 inches). When doing so, the compound would burst into flame. I think the acetate and formate began to rapidly combust. Doing the experiment in a test tube limited flow of fresh air into the tube, so combustion was avoided. At least that's what I currently think.

Thanks for answering.

One could dissolve the copper salt in water and electrochemically reduce the copper ions. This of course can be done with other copper salts, too.

@@TommyTechnetium i mean cu formate without using fire maybe add this and that thus copper mirror precipitation

@@dogodogo5891 I'm not aware of any chemistry that will do what you're suggest. Please do let me know if you learn of methods to do this!

Good question...

Good question...

Nope sulfate is also an oxidizer and it will not reduce metal ions to metal mirrors

yep thermite reduction, metallurgy

try this form of 3d printing with laser engraver, yep direct metal laser sintering with a liquid or powder, whatever this is

the temperature for laser growth from powder is much less than then metal melting point, ie 1200C vs 200C

you could even cast with this in oven, in a mold

even in 3d printed molds, like ABS, which has higher melting point than acetates, 220C vs 240C