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<p>[QUOTE="gsimonel, post: 3259032, member: 82549"]Smack!</p><p><br /></p><p>About wire brushes: I see no reason to use a steel-bristle brush when brass-bristle brushes are so readily available at most hardware and department stores. We geologists have a mantra: "objects scratch objects that they are harder than." (Geologists make really boring mystics.) Steel is harder than bronze and will scratch it. Brass is softer and will not. Both will scratch silver. Brass will not scratch bronze coins and can be used without damaging it in most cases, <b>BUT </b>brass can be harder than the surface patina on some coins and leave scratches. This is especially the case with coins with a pale, light green patina, which can often be very soft. I have damaged coins with this kind of patina using a brass-bristle before, so be very careful with this type of surface. You should be okay on most other types of surface patina, though. Of course, it never hurts to check first. Maybe lightly brush an edge or rim and check carefully for any damage before going any further with it.[/QUOTE]</p><p><br /></p>
[QUOTE="gsimonel, post: 3259032, member: 82549"]Smack! About wire brushes: I see no reason to use a steel-bristle brush when brass-bristle brushes are so readily available at most hardware and department stores. We geologists have a mantra: "objects scratch objects that they are harder than." (Geologists make really boring mystics.) Steel is harder than bronze and will scratch it. Brass is softer and will not. Both will scratch silver. Brass will not scratch bronze coins and can be used without damaging it in most cases, [B]BUT [/B]brass can be harder than the surface patina on some coins and leave scratches. This is especially the case with coins with a pale, light green patina, which can often be very soft. I have damaged coins with this kind of patina using a brass-bristle before, so be very careful with this type of surface. You should be okay on most other types of surface patina, though. Of course, it never hurts to check first. Maybe lightly brush an edge or rim and check carefully for any damage before going any further with it.[/QUOTE]
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