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03-18-2015, 08:08 PM #1
That is up for debate. My thoughts are a 100 year or less gap in when the stones were mined wouldn't make much of a difference in a rock that took millions of years to create in the first place. It's also hard to tell if that's a BBW or slate on the back of your Citi. That is up to you to find out. It just looked like to me in the picture to be a slate backing but it could very well be a glued piece of BBW. Whatever the case it is not a natural combination stone. Play around with it when you're ready.
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03-18-2015, 08:28 PM #2
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03-18-2015, 08:35 PM #3
The first picture is a BBW beside a piece of slate used to back a coticule. Distinct colour difference. The second picture is a picture of the slurry produced on a BBW. Hope this helps.
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daverojo77 (03-18-2015)