Headrush
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Yes, always start with a fully cleaned and fluxed joint. As you evenly heat the brass, keep dropping flux onto the joint with the end of your solder, hopefully your solder will suddenly run in.
When the joint has cooled, clean it up with some wire wool and use a torch with a small mirror to look round the joint. You should see a bright ring all around inside joint, it might be microscopic but you should see it.
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