4 ms·
I grew up in Pittsburgh. During my childhood I remember a lot of black stone buildings. I always assumed there was some kind of dark colored stone that was used
by noer 8y ago
I grew up in Pittsburgh. During my childhood I remember a lot of black stone buildings. I always assumed there was some kind of dark colored stone that was used to build buildings & churches. It wasn't until I was 12 or so that these buildings started getting cleaned that I realized they were all soot stained.
- Isamu 8y agoHere's a pic showing the soot being cleaned from Carnegie Library - pretty black indeed. I kinda remember those days. https://www.reddit.com/r/powerwashingporn/comments/6ev3pe/carnegie_library_being_sand_blasted_in_1990/ https://www.reddit.com/r/powerwashingporn/comments/6ev3pe/ca... They say "sand blasted" but I'm pretty sure they used gentler methods.
- milesokeefe 8y agoSome power washers integrate sand into the water stream. So sandblasted, but by a high pressure jet of water carrying sand instead of air blasted sand.
- bobbiechen 8y agoIt's pretty stark to see the difference between the cleaned and dirty buildings. There are sections of the Mellon Institute columns [1] which are uncleaned as a reminder of how bad they used to be. [1] https://www.atlasobscura.com/places/mellon-institute-columns https://www.atlasobscura.com/places/mellon-institute-columns