January 1, 1970 |

Spraying on potassium silicate, a chemical which reconsolidates sandstone to pro

Spraying on potassium silicate, a chemical which reconsolidates sandstone to protect it from the elements, but does not change its natural chemistry, color, or breath ability. It hardens the stone. I wish they would do it to more of the brownstones around town. This sandstone is so fragile!

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