Message:

<p>[QUOTE=&quot;physics-fan3.14, post: 2999956, member: 19165&quot;]No, it is actually the exact opposite of that. Metals naturally gain a patina, which is a surface oxide or sulfide layer. This passive layer slows down and protects from further corrosion. When you dip a coin, you remove that layer - which accelerates further corrosion. </p><p><br /></p><p>When we talk about &quot;secondary toning after a dip&quot; or &quot;dip toning&quot;, that is created because some of the dip was left on the coin. Dip, being at a non-neutral pH, is going to accelerate the corrosion even further.[/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