I think Ingo´s got a point there; it seems likely that it would look pretty much the same. Possibly, a dipped object might show a little thicker and possibly more uneven copper alloy-coating than an object soldered in a clay-package. When soldering in clay, you can quantify the exact quantity of bronze you want to add to the iron. When heating, it will easily run and cover the object with a very thin and even coating. As the iron and copper-alloy slowly reaches the same temperature-level at the same time, you might see a slight fuse or alloying between the materials at the join. Though, perhaps the same phenomenon would be found at a dipped object.
I think it could be hard to decide the technology used, from studying only the metalpieces themselves. This must be combined with a study of clay-fragments from workshops, in order to find possible debris from clay coatings. For a start it could be recommended to look for vitrified "crucible"-fragments with inside imprints of objects. So far, we´ve seen a lot of them in Scandinavia with padlock- and possible key-imprints.
Anders Söderberg
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