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<p>[QUOTE="Ownedbybear, post: 98704, member: 29"]I've never ruined a single one of the objects I've cleaned, and I've been doing it for a very long time indeed. I've also owned many of them for decades. I use china almost every day that's close on a century old. I use damask tablecloths that are late 19th C, and my dining table was made in about 1780. And of course, these things were made to be used, and to be cleaned using very primitive methods. </p><p><br /></p><p>Like I said, if it's museum quality stuff, and fragile as some is, then conservator methods may make sense. But this isn't what we're looking at here. We're talking every day antiques. </p><p><br /></p><p>As to molecular structure. I presume you're talking about a chemical or physical reaction - or both - that results in outputs which are different from the starting point, and which may or may not involve a catalyst or reagent. </p><p><br /></p><p>Using the term molecular structure in the context of something like pottery is, imo, somewhat misleading. Pottery and china and glass don't consist of single molecular types but of compounds, depending on the underlying recipe. It's actually relatively difficult to alter the compounds, and very difficult to change the underlying molecular structure. They're pretty inert materials - even glass sickness, for example, is, as I'm sure you know, merely a surface degradation. And the accepted treatment for that, professionally, is the use of muriatic acid, which reacts with the surface salts and hopefully removes them. The reason they're so inert is partially the compounds involved, but also the processes used, such as firing and tempering. </p><p><br /></p><p>Metallic objects which are non compound are, of course, another matter.[/QUOTE]</p><p><br /></p>
[QUOTE="Ownedbybear, post: 98704, member: 29"]I've never ruined a single one of the objects I've cleaned, and I've been doing it for a very long time indeed. I've also owned many of them for decades. I use china almost every day that's close on a century old. I use damask tablecloths that are late 19th C, and my dining table was made in about 1780. And of course, these things were made to be used, and to be cleaned using very primitive methods. Like I said, if it's museum quality stuff, and fragile as some is, then conservator methods may make sense. But this isn't what we're looking at here. We're talking every day antiques. As to molecular structure. I presume you're talking about a chemical or physical reaction - or both - that results in outputs which are different from the starting point, and which may or may not involve a catalyst or reagent. Using the term molecular structure in the context of something like pottery is, imo, somewhat misleading. Pottery and china and glass don't consist of single molecular types but of compounds, depending on the underlying recipe. It's actually relatively difficult to alter the compounds, and very difficult to change the underlying molecular structure. They're pretty inert materials - even glass sickness, for example, is, as I'm sure you know, merely a surface degradation. And the accepted treatment for that, professionally, is the use of muriatic acid, which reacts with the surface salts and hopefully removes them. The reason they're so inert is partially the compounds involved, but also the processes used, such as firing and tempering. Metallic objects which are non compound are, of course, another matter.[/QUOTE]
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