Message:

<p>[QUOTE=&quot;Burton Strauss III, post: 2524786, member: 59677&quot;]It&#039;s called work hardening - you often see it in the context of metal work on shows like &quot;How&#039;s it Made&quot;. But apparently the slight difference in compression is enough for the acid to differentially remove the metal. It&#039;s not a big difference, which is why if you leave it too long in the acid, poof - it&#039;s all gone.[/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