We have a large marble surround fireplace. At least I thought it was marble until my son pulled out a piece, and it turns out it’s grey slate. It is black with gold and white ‘marble’ effects. The ...

I have the pieces (I hope all of them) of three slate mantles in my basement, which I’m hoping to re-install. They’re covered in about 500 layers of paint. I couldn’t save the original ‘marble’ finish ...