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It's probably enamel (paint) coated. Newer types have a coating that comes off with the heat from a soldering iron but the old ones need paint remover or scraping. There is stuff formulated for that but it's a shame to buy a bottle for one job (I haven't been able to remember the name of it). So scrape.
If you use a knife, it's easy to break the wire. Sandpaper works too. Once you see copper you can solder to it.
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