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<p>[QUOTE=&quot;Conder101, post: 2340365, member: 66&quot;]Actually the dies do have a thin film of oil on them,&nbsp; The tool steel rusts easily so it has a protective il film.&nbsp; The planchets are also oiled to help keep them from sticking or biding the the feeding tubes.&nbsp; Well oil tends to collect dust and dirt and it eventually builds up and can become clumps of &quot;grease&quot;.</p><p><br /></p><p>It wasn&#039;t so much a theory about why the 4 disappears on the steel cent as it was an observation that different issues tend to develop grease fills in specific places.&nbsp; Examples are the 4 on steel cents, the E in STATE of DE quarters, the letters arter oa on the CT quarter, the mintmark on NH quarters,&nbsp; the last E in INDEPENDENCE on the Bicentennial half dollar.[/QUOTE]</p><p><br /></p>

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