My father was digging in our garden 4 days ago and found a broken piece of white marble buried in the ground. It is a piece of white carrara to be exact. Most likely it was part of a fireplace hearth(floor) that was removed form our house or next door in the last 40 years or so in the north side of Pittsburgh.
So I took a little time to clean the stone up. I don’t know if you can see the mildew on the piece in the first photo. I have a video removing the mildew, but that’s for another post. Just from cleaning you can start to see that this is a very nice stone. It’s a shame someone ripped it out of the house. But will it ever shine again?
Wow did this stone take a polish! It does however have some problems with rust stains. This is not a surprise as all of the white carrara fireplace hearths, I’v seen in Pittsburgh, are in hundred year old homes and have tons of rust. The fire place was a very important part to these homes. The marble made a great show piece, and the white carrara was a great choice for a hearth. It is however very acceptable to rust. I have yet to see one of these old stones restored, where the rust is totally removed. I am going to do some experiments with this stone, in the next few months. Sealer tests, extreme rust removal tests, and much more. Ill keep this post updated as we have fun with this stone that was buried in our back yard.
UPDATE 5/10/12: RUST AND STAIN REMOVAL
As you can see this stone has some major stains. These stains would not come out by grinding. Some of the stains are rust for sure, but others are a mystery. If mechanical action would not remove the stains then we had to try a chemical reaction. We soaked the stone in a product for 4 days. Then I re-honed and polished the stone. What amazing results for a stone that has suffered so much abuse.