It is very strange. I am told it is blue-black slate, and we have worked on a fair amount of it around here (they quarry it nearby) and have not run into this problem.  Also, this is the softest I have run into.  Maybe it is some sort of soapstone, but I don&#39;t thinks so.<br>
B<br><br><div class="gmail_quote">On Thu, Oct 20, 2011 at 4:45 PM, stuart rosen <span dir="ltr">&lt;<a target="_top" href="mailto:mail@stoneshine.com">mail@stoneshine.com</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>Is the slate even porous-</div>
<div>It sounds like something moisture could do but it is a countertop.If the linseed oil penetrated,</div>
<div> 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.</div>
<div>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?<br><br></div>
<div class="gmail_quote"><div class="im">On Thu, Oct 20, 2011 at 2:51 PM, Fred Hueston <span dir="ltr">&lt;<a target="_top" href="mailto:fhueston@gmail.com" target="_blank">fhueston@gmail.com</a>&gt;</span> wrote:<br>
</div><div><div></div><div class="h5"><blockquote style="border-left:#ccc 1px solid;margin:0px 0px 0px 0.8ex;padding-left:1ex" class="gmail_quote">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 
<div>
<div></div>
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<div class="gmail_quote">On Wed, Oct 19, 2011 at 6:43 PM, Baird Standish <span dir="ltr">&lt;<a target="_top" href="mailto:bairdstandish@gmail.com" target="_blank">bairdstandish@gmail.com</a>&gt;</span> wrote:<br>
<blockquote style="border-left:#ccc 1px solid;margin:0px 0px 0px 0.8ex;padding-left:1ex" class="gmail_quote">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.<br>

Thanks much.<br>Baird<br clear="all"><br>-- <br>________________________________________<br>From the desk of<br>Baird Standish<br>Managing Partner<br>Facility Specialists, LLC<br>1616 Walnut St.<br>Philadelphia, PA 19103<br>

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</div></div></blockquote></div><br><br clear="all"><br>-- <br>________________________________________<br>From the desk of<br>Baird Standish<br>Managing Partner<br>Facility Specialists, LLC<br>1616 Walnut St.<br>Philadelphia, PA 19103<br>
Phone: 215-732-7505<br>Fax: 215-546-9160<br>