The word solder comes from the middle Englis word soudur, via Old French solduree and soulder, from the Latin solidare, meaning '‘to make solid’'.
In silversmithing or jewelry making, special solders are used. They contain a high proportion of the metal being soldered and lead is not used in these alloys. These solders also come in a variety of hardnesses, known as 'IT', 'hard', 'medium' and 'easy'. IT solder has a high melting point, close to that of the material itself, to prevent the joint desoldering during firing in the enamelling process. The remaining solder types are used in decreasing order of hardness during the process of making an item, to prevent a previously soldered seam or joint desoldering while soldering a new joint. Easy solder is also often used for repair work for the same reason.
-kathleen
www.pouncingrain.com
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