Message:

<p>[QUOTE=&quot;Info Sponge, post: 701079, member: 20538&quot;]I read one person&#039;s opinion that the spots are silver chloride, which is close to insoluble. If part of the processing is a hydrochloric acid application which is not properly rinsed off, then this opinion is plausible.</p><p><br /></p><p>Now if that&#039;s it, there are a few ways to dissolve silver chloride. Maybe someone with coins they can afford to lose will be willing to experiment.</p><p><br /></p><p>Do not try these on a valuable coin unless they&#039;ve been proven to be safe.</p><p><br /></p><p>The simplest is ammonia. This may darken the silver and destroy the luster. </p><p><br /></p><p>The other is sodium thiosulfate. This used to be readily available as a film processing chemical back when there was film. Try an old photographer or a chemical supply place.</p><p><br /></p><p>The experimenter should try warming the solution (which unfortunately causes fumes with the ammonia) and should obviously rinse thoroughly afterward. Gentle stirring without touching the coin would make sense.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in