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Alex,

Yes, I have lapped it and no, the color did not change. The sides show the same color through and through--it appears to be a very homogenous stone.

In addition, the professionals I asked...

Kutsuki is to the West of Takashima, near the border between Kyoto prefecture and Shiga prefecture. If you'd like to know more, try looking for Latitude 35.353216, Longitude: 135.845947 on Google...

I used a Kutsuki Kiita from Shiga-ken. It's sold as a Honyama stone, though it is not. It's a testament to the fact that Kyoto is not the only source for good stones. It's hard and fine, though a...