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<p>[QUOTE=&quot;Joan, post: 9574308, member: 5398&quot;]Thank you, AJ, for the tip about looking at the acid drop from the side. The first couple of times I squeezed a drop on the black tile it didn&#039;t form a bubble...just spread way out beyond the scrape. So I decided to give the bottle a few good shakes (hoping it wouldn&#039;t explode), and then it formed a bubble on the stone, so I&#039;m wondering what that means, but am anxious to try it on an unglazed white tile.[/QUOTE]</p><p><br /></p>

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