Softening Copper Wire for Bonsai Use
Every year, at this time, I prepare my copper wire for use in the coming year. I buy 'annealed' copper wire but it is never soft enough so I go through the annealing process myself, in Winter when it is safe, and cold enough, to sit around a fire. I have always heated the prepared coils to a 'dull red' and quenched the coils in water. Quenching in water is not necessary for the softening process but helps blow off some of the oxide that forms during annealing; giving the wire a really natural look that blends well with the bonsai.
I generally use 1.22mm, 1.63mm, 2mm, and 4.1mm copper on my bonsai. After softening even the 4.1mm wire is easy to apply. !!