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<p>[QUOTE="lrbguy, post: 3528811, member: 88829"]Not quite. Smoothing is the removal of accretions, including substances which may have chemically bonded with coin material at the surface. Patina is the metallic salt that forms at the surface of the coin, and consists partly of coin material and partly of outside chemicals. But accretions are added deposits and adhere to the surface from outside the coin itself. Clearing those off is what smoothing is about, whether in the fields or in the devices.</p><p><br /></p><p>However, when a coin of Julia Domna is converted into a coin of another empress, the process by which that conversion is made is called "tooling." It gets down into the fabric of the coin itself and makes alterations. Something tells me, however, that NGC defines these terms according to modern standards and not according to the lexicon of antiquities conservation.</p><p><br /></p><p>When a coin is worn down so that original engraving lines are lost, any attempt to restore those lines with new cutting and not merely the removal of accreted substances, ventures into the category of tooling. It all has to do with the limits of the original surface.[/QUOTE]</p><p><br /></p>
[QUOTE="lrbguy, post: 3528811, member: 88829"]Not quite. Smoothing is the removal of accretions, including substances which may have chemically bonded with coin material at the surface. Patina is the metallic salt that forms at the surface of the coin, and consists partly of coin material and partly of outside chemicals. But accretions are added deposits and adhere to the surface from outside the coin itself. Clearing those off is what smoothing is about, whether in the fields or in the devices. However, when a coin of Julia Domna is converted into a coin of another empress, the process by which that conversion is made is called "tooling." It gets down into the fabric of the coin itself and makes alterations. Something tells me, however, that NGC defines these terms according to modern standards and not according to the lexicon of antiquities conservation. When a coin is worn down so that original engraving lines are lost, any attempt to restore those lines with new cutting and not merely the removal of accreted substances, ventures into the category of tooling. It all has to do with the limits of the original surface.[/QUOTE]
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