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<p>[QUOTE="calcol, post: 24699872, member: 77639"]The spots may be due to sweat, spit or snot, deposited long ago. In that case, the spots will be mostly dried, denatured protein along with some salts, which may have caused some corrosion. For these biocontaminants, acetone and water rinse are unlikely to do much. Best choice is an ultrasonic cleaner with warm distilled water and a simple, chemically pure detergent. Example of a simple, chemically pure detergent is sodium lauryl sulfate … available on Amazon and cheap. Sodium lauryl sulfate is an anionic detergent (most household detergents are), so a solution of it is slightly alkaline. Therefore, coins should not be exposed to it for more than the time they spend in the ultrasonic cleaner. An alternative is a nonionic detergent such as BRIJ, Triton or Tween. They don’t have an effect on pH. Whatever you use, do a good rinse in distilled water afterward.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>
[QUOTE="calcol, post: 24699872, member: 77639"]The spots may be due to sweat, spit or snot, deposited long ago. In that case, the spots will be mostly dried, denatured protein along with some salts, which may have caused some corrosion. For these biocontaminants, acetone and water rinse are unlikely to do much. Best choice is an ultrasonic cleaner with warm distilled water and a simple, chemically pure detergent. Example of a simple, chemically pure detergent is sodium lauryl sulfate … available on Amazon and cheap. Sodium lauryl sulfate is an anionic detergent (most household detergents are), so a solution of it is slightly alkaline. Therefore, coins should not be exposed to it for more than the time they spend in the ultrasonic cleaner. An alternative is a nonionic detergent such as BRIJ, Triton or Tween. They don’t have an effect on pH. Whatever you use, do a good rinse in distilled water afterward. Cal[/QUOTE]
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