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Brass is a metal that has pores. What this means is that an item that is made of brass weathers or tarnishes not only from the outside inwards, but also can tarnish inside (sub-surface) and spread outwards. Brass in made of copper and other metals (this is called an alloy) and Brass Shine liquid polish only cleans and removes tarnish on the outer layers of the brass. If you clean something and there are still water spots or dark areas and a few treatments of our Brass care cloth or brass shine polish do not successfully remove the tarnish, then a specialist needs to look at the piece. A typical example of this is a one of a kind item that has been sitting in an attic or outside for an extended period (years?). This is where you may need a professional in the field to assist the consumer. This has the brass tarnish eater so that not only will tarnish be removed, but a protective coating is left behind. 8 FL. OZ. Blitz Stock #20636
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