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<p>[QUOTE=&quot;areich, post: 1519309, member: 37479&quot;]This is not 1800.&nbsp; I know this first hand because i have to constantly try to fix mistakes made in the 1800&#039;s and the 20th century.&nbsp; One result of this experience is that in restoration, and even in conversation (two very different things), whatever is done, we make an effort to ensure it is easy to identify and maximally reversible.&nbsp; This has not much to do with the current topic, but i enjoy talking about it 28 hours a day.</p><p><br /></p><p><br /></p><p><br /></p><p>The chemistry of conservation, something I do not have a degree in but only some background, has nothing to do with vapor pressure, but reactivity, of which there are mostly 3 kinds that have to be most accounted for:&nbsp; redox, acid-base, and biological induced.</p><p><br /></p><p>Metals will react in any situation where there is chemical potential.&nbsp; Metals with a a normal chemical potention in the -.500mv range, are aggressive chemical reactants and catalysts.&nbsp; Metal alloys, a bit less.&nbsp; Humidity is the true enemy of metals, that and a lack of an even, healthy metal tone.&nbsp; Keep in mind that conversation of items like coins, for example, is far different than what we would do for musical instruments and silver ornamental dining utilities (see the Fricks wonderful collection). Also, what museums consider conservation and what coin collectors consider conservation are two different things.</p><p><br /></p><p>In the case of coins, with the emphasis of original surface and delicate design, primary toning is vital for long term conversation and therefor coins should never be in a vacuum or an airtight condition.&nbsp; <b>An item can NOT be conserved if it is existing in an environment that is not natural or reasonably maintainable for the objects usage.</b>[/QUOTE]</p><p><br /></p>

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