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<p>[QUOTE=&quot;moreotherstuff, post: 9559841, member: 56&quot;]It may very well have yellowed varnish, but removing it is work for a professional and requires solvents that could damage the painting.&nbsp; Since this has been behind glass, there&#039;s maybe not a lot of surface grime, which turps might remove, but be very careful even trying that.&nbsp; Damage once done can&#039;t be undone.</p><p><br /></p><p>If the varnish has yellowed, cleaning the surface might brighten it a bit, but it won&#039;t remove the yellow.&nbsp; It shouldn&#039;t remove the varnish.</p><p><br /></p><p>I don&#039;t think cleaning will make much difference to the value.&nbsp; The potential for damage is there, and it could lead to a later restoration headache.[/QUOTE]</p><p><br /></p>

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