I have some copper colloids and managed to make a gel out of them in an attempt to create copper wrap for my child's project. So far I have not been successful in the copper gel route so I remade the colloidal copper nanoparticles. How can I make the size/mass/density o the nanoparticles greater so that I can create copper wrap from them and wires, perhaps even a coin? I wish to do this without increasing the concentration of copper meaning I don't want to add more nanoparticles into the solution I want to increase what I already have. How can I do this?