Mercury gilding is a method used to decorate silver traces during the Sassanid period. It has features that make the gold layer firmly attached to the silver base and the gold layer does not detach from the work over time. In this research. this question on has been raised as to what caused the gold layer to last on the silver surface. https://parisnaturalfoodes.shop/product-category/medi-c-plus-w-ca/