Message:

<p>[QUOTE=&quot;fagaly, post: 763767, member: 22003&quot;]<b>cleaning coins</b></p><p><br /></p><p><br /></p><p><br /></p><p>Funny post. Under OPTION 3-5, I&#039;d add the old college chemistry standby for removing organics - &quot;cleaning solution&quot; which was potassium chromate dissolved in sulfuric acid. Of course, this only works for glass coins.</p><p>(formula intentionally incorrect because this is <i>really</i> nasty stuff and will have the EPA on your doorstep when you try to dispose of it:headbang<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Serious comment: using any acid on coins <i>will</i> alter surfaces. The alteration is proportional to how long it sits in the acid. To remove the toning from a really dark coin, will require so much exposure to the acid that the surfaces will be visibly changed (and say goodbye to any luster that might have been present).[/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