Naturally, at NOBBON we do not have time to wear all jewellery ourselves and wait for oxidization to occur. That is why we dip the silver into a bath of liver of sulphur, resulting in an oxidation and turning the silver jewellery into black. Should we want to reverse this process, we could do so by letting the jewellery take a dive into a jar of Hagerty Jewellery cleaner or sulphuric acid.
None of the silver oxidized jewellery manufactured by NOBBON will rub off on the skin. It is however important to know that the silver item will polish itself, given it will come in contact with harder materials and will slightly discolour as a result. This will occur with rings more often than colliers, since they simply have more to suffer on a daily basis.