![]() These properties are all in comparison with verdigris, which is normally a duller shade, uniform across the whole of the affected object, and cannot be scratched off with wood or fingernails. The patches of bronze disease can be scraped off the surface using a fingernail or a wooden pick. Bronze disease typically affects isolated patches of the object in severe cases being a visibly and tactilely raised bloom of microscopic crystals as well as being associated with pitting. It is commonly present in all colors in this range due to the series of reactions that cause it and there may also be tiny, possibly microscopic, blue crystals. īronze disease ranges from vivid green to pastel green. It is not reserved for antique objects but can affect contemporary metals like modern cupro-nickel coins. Despite its name, bronze disease can affect any copper-bearing alloy, not just bronze. It is contagious in that the chlorides which cause it can spread the condition if they are brought into contact with another cuprous object. It was originally thought to be caused by bacteria. Bronze disease is the chloride corrosion of cuprous (copper-based) artefacts.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |