Not to take anything away for the creativity shown, but just pull the wire through a scrap of sandpaper between thumb and forefinger.? That removes all the varnish and leaves you with a shiny wire that solders great (tinned or un-tinned).??
Now I know that you-all are thinking, like I did: "Couldn't that easily damage the wire by breaking it or making it brittle?"? So, I did a little experiment with some 320 grit paper.? After the wire was clean, I continued to pull it through the paper to see what it would take to damage it.? I gave up after about 50 pulls!? Even with pretty fine gauge wire, there is plenty of margin.? Use a medium grit so you aren't tempted to squeeze too hard and start stretching the wire, which will make it brittle.??
Any form of scraping risks damage, and burning can be hit or miss. Give it a try!
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Cheers,
Chuck
