To preserve the high-contrast details and the antique blackened appearance (burnishing) of this Viking ring in the long term, it should be cleaned in lukewarm water with a mild detergent and then carefully dried with a soft cloth. It is important not to overdo it when polishing, as excessive cleaning could remove the desired blackening and reduce the contrast. Furthermore, contact with seawater, sweat, chlorine, and harsh cleaning agents should be avoided to prevent uncontrolled oxidation.