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<p>[QUOTE=&quot;Bronwen, post: 735750, member: 5833&quot;]Virtually all the natural materials used for cameos are porous to some degree, even chalcedony; many are also too delicate for harsh cleaning materials/methods.&nbsp; Ink &amp; pencil are the common culprits, suspect some cameos get raked with other silver jewellery.&nbsp; Fine scratches can trap &amp; hold grime that may require a fair bit of soaking &amp; brushing to remove, if the material allows.&nbsp; Lava &amp; ivory can be stained by any kind of oil, including skin oil.&nbsp; Coral seems to resist staining more than shell does, but since it is also often dyed, care must be taken when cleaning is required.&nbsp; Lava can also lose color if it has been dyed.&nbsp; I usually remove very dirty lava pieces from purchase consideration: too easily stained; too risky to clean.</p><p><br /></p><p>Pieces can be marred through damage to the finish that dulls it without actually staining it.&nbsp; Caustic or abrasive cleansers, ultrasonic cleaning, Byne&#039;s disease, do damage that cannot be reversed.[/QUOTE]</p><p><br /></p>

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