Message:

<p>[QUOTE=&quot;BadThad, post: 977154, member: 17261&quot;]The adsorption is fixed by the area of exposed metal. The rate is sufficiently slow that the toning will be evenly distributed the same as the natual process. As the metallic sulfide is formed it goes though a distinct color progression that is determined by the thickness of the sulfide layer, i.e. thin film interference. The progression for silver is yellow&gt;gold&gt;reddish&gt;purple&gt;blue&gt;black. The reaction with VT is slow enough that the collector will be able to stop the toning when they want.</p><p>&nbsp;</p><p>My point is that there is no &quot;unstable matrix&quot;. The formation of the metallic sulfide will progress until there is no more metal to react with.[/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