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<p>[QUOTE=&quot;desertgem, post: 476553, member: 15199&quot;]Drusus,</p><p><br /></p><p>&nbsp;&nbsp;&nbsp; The photoresist use for printed circuit boards might not take strong acids. It was used with potassium ferrocyanide solution if I remember how I made PC boards decades ago. There was also &quot;resist tape&quot; of varying width one could use for similar purposes.</p><p><br /></p><p>Sandblaster people ( like for grave stones) have a photoresist resist material that can be used to etch markings into stone. That might withstand the acid better.</p><p><br /></p><p>I really am impressed! </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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