Hi Forum members. Attached is a Prussian 25 year LS Decoration. From 1st appearance it looks to be in presteigne condition. However when looked at VERY closely, there are some small areas and spots of verdigris appearing which indicates that it is of bronze and gilt plated, "No maker mark visible,) with the surface finish wearing off in some small areas. In order to prevent further deterioration and save it in it's best condition for future custodians, how would members think of preserving it. Vaseline, WD40, Nail varnish, Tomato ketchup! Laquer, The medal is kept in a stable temperature and moisture environment but i would be most unhappy if after all the efforts, it still got worse. Does anyone have any recommendations? regards Alex