koristevalussa

Koristevalussa is a Finnish term used in metalworking to describe decorative casting, where ornamentation is integrated into the piece during the casting process rather than added later. The concept covers methods that create a raised or recessed ornament as part of the final metal object.

The most common techniques grouped under korostevalussa include lost-wax casting (invested wax model that is burned away to form a mold) and sand or shell casting, in which a mold is prepared with the desired decorative pattern. Molten metal is poured into the mold and, after cooling, the piece is finished through cleaning, filing, polishing, and sometimes patination. These methods allow intricate details and relief designs to be produced with relatively high fidelity.

Materials used for decorative casting range from traditional copper alloys such as bronze and brass to precious metals like silver and gold, as well as pewter and zinc alloys. The choice of material influences the level of detail, finish, and intended use, from jewelry and belt fittings to weapon adornments and architectural hardware.

Applications and motifs vary, but koristevalussa often features integrated ornamentation with motifs such as vegetal or floral patterns, geometric designs, and stylized animals. The technique has historical roots in various cultures and persists in contemporary Finnish and Nordic crafts, where it is valued for producing durable pieces with seamless ornamentation.

See also: metalworking, casting, lost-wax casting.