Is the slate even porous-
It sounds like something moisture could do but it is a countertop.If the linseed oil penetrated,
 it wouldnt have been easy to remove-blue black slate can be very dense like roofing quality. The color enhancer is acting like a topical and if the white marks are within the stone maybe they belong there.
Could it be soapstone? We did a grey/(black after we loaded it up with mineral oil) soapstone that had these white marks within the stone?

On Thu, Oct 20, 2011 at 2:51 PM, Fred Hueston <fhueston@gmail.com> wrote:
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 <bairdstandish@gmail.com> 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.
Thanks much.
Baird

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