Foam gold, for example, was used: a very thin gold sheet was placed in the appropriate form and then poured with plaster. In the Cannetille technique, on the other hand, gold or silver wire was used to form a framework of tendrils and shapes as filigree as possible, which could hold large gemstones. Biedermeier jewellery is also often light metal jewellery, produced in large quantities by machine pressing. In this case tombac, a brass alloy without any gold content, was used.