Quote Originally Posted by T-Bone View Post
I've been thinking about this some more this afternoon.
If the leather is chrome tanned, you will not get to the buff color. It will be a light gray color. It will, however, be roughed up and ready to apply the Blanco. I would try sanding the back of the harness or somewhere inconspicous to see the results.
That's not entirely true. Assuming the leather was aniline dyed (most are, as it stabilizes the hide) and then surface dyed (which it obviously was) you cannot tell what the underlying colour actually is. You cannot assume that the colour is "struck through".

The inner colour could vary from white to off-white, all the way down to buff.