Bronze Age artefacts have beautiful silvery glow. The 500 artefacts are unusual in that they have high levels of tin on the surface. It is thought that it was deliberately done by technologically creative skilled craftspeople and would have showed the high status and wealth of the owner. The items are undergoing cleaning and restoration work which is expected to take about three years. https://www.bbc.co.uk/news/articles/cjw9d9wwg26o