Hmm...
Not I.
I used quite a dark pigmented organic extra virgin olive oil, and when I crushed the stones, they were exactly the same colour as the oil, and the consistency of wax, which is basically just oil with the water component taken out.
I think I'm going to to a little experiment and actually combine the oil, grapefruit, Epsom Salts and water in the same jar. My guess is that the components would form solid globules, not at all unlike the 'stones' we're all apparently passing!