If you are working on the piece, heat could reveal solder. In fact low solder could actually melt again. BUT I think you mean heat when wearing a piece of jewelry with solder joints. If you used solder on copper, brass, or even gold, the silver solder is going to show. Typically you file/sand it down to the bare minimum needed to keep the joint and it will be very difficult to see with the naked eye. However, if you patina the piece, I suppose it may be possible that the solder joint might accept the patina differently, but I've never heard of it coming off, even in heat. If you can give us some idea of how much heat, temperature wise, and the condition, we might be able to help more. But if I were going to make a short and sweet answer to this, it would be "no." Teri sandtcreations.com/wordpress
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Revealing solder joints by: John The Jeweler
In order to locate solder joints with heat, use a cool flame on the un-fluxed peace of jewelry. This will cause the jewelry to tarnish and the solder joints will tarnish a different color than the rest of the peace.
The switch knot is a decorative lacy macrame/ hemp jewelry knot that helps you save on twine too. This tutorial shows you how to tie one with clear pictures and instructions.
A sliding knot is a wonderfully easy way to end off a leather, string, hemp, or corded necklace or bracelet. It looks neat and stylish, is a very practical closure, and is very easy to make.