Quote Originally Posted by onimaru55 View Post
What grit paper are you lapping with & how hard are you pushing on the stone ?
I wonder if the particles are from the paper getting embedded. Lapping the stone with a diamond plate would show if the paper or stone is at fault.
I'm using 180 grit wet and dry, and the weight of the stone and a little more.

I do not believe that the anomalies in the stone are from an external source, both for the reasons stated above, and also, 180 grit wet and dry could not shed a particle almost 1mm in diameter, and the anomalies are not hard single particles, more like clumps of a slightly different consistency within the matrix. A 1mm abrasive particle would completely ruin a razor, which is not happening. All that is happening is that I'm not getting the polish and edge I would expect.

I agree that a diamond plate is an ideal solution. And your suggestion of lapping off a decent-sized layer to see if the anomalies run all the way through the stone is a good one which I will try.