Message:

<p>[QUOTE=&quot;physics-fan3.14, post: 4404277, member: 19165&quot;]Think about the motion you make when scrubbing a pan. Most of us scrub several times back and forth in the same direction. Very few people take one pass at one direction, then the next in another direction. Most of us would also make a scrub across the entire coin - the lines generally cover a wide part of the coin in parallel lines. Now, you might rotate and scrub again in another direction - but you&#039;re going to go back and forth several times in the same direction. </p><p><br /></p><p>You wouldn&#039;t see short, light marks in multiple directions on a coin like this which had been cleaned unless it was an *expert* cleaning very, very carefully.[/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