did you check the stone for moisture..It sounds like you could have a moisture problem. If thats the case the spots will continue to come back--
On Wed, Oct 19, 2011 at 6:43 PM, Baird Standish <firstname.lastname@example.org> wrote:
Hi. We recently touched up a blue-black slate counter that the owner had been treating with linseed oil. The linseed oil created a heavy build up, which we removed and then applied a color enhancing impregnating sealer. The result was great. However there were some white rings and spots that were in the stone (within the stone, not on the surface - like stun marks in marble). After a couple of weeks the white spots are coming back and I am going to apply a little more of the impregnating sealer to see if that subdues them. But I am wondering if there is some sort of treatment I can use on these little areas that will be more permanent and will not require constant touch up.
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Frederick M. Hueston PhD
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