Message:

<p>[QUOTE=&quot;acanthite, post: 168835, member: 6647&quot;]I&#039;m trying not to repeat too much of the above.</p><p>&nbsp;</p><p>Toning is metal reacting with certain compounds in the surroundings.&nbsp; The two most likely contain oxygen and sulfur.&nbsp; Most metals in pure form are trying to become oxides in atmospheric conditions.&nbsp; If sulfur is present as a contaminant in the air or other medium like paper, it will also generate changes in the pure metal.&nbsp; Constant temperature, low humidity, these factors will help slow the process, but oxygen is everywhere.[/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