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<p>[QUOTE=&quot;Stevearino, post: 2650866, member: 74571&quot;]Thanks, my chemistry friends. I won&#039;t be afraid to use the indicator with the silica. I, too, used to sneak chemicals out of the HS lab: hydrogen sulfide to put in the vents (amazing no one died); mercury to roll around the floor in study hall; sulfur, saltpeter and charcoal for gunpowder (I did accidentally blow up a mustard jar and got a shard embedded in my thumb).&nbsp; Angels watch over kids and fools (I was both).</p><p>Steve[/QUOTE]</p><p><br /></p>

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