Carbon Tec
Some times I marvel that I am still alive and in reasonable good health. In the 50’s I was in the USN Photo School in Pensacola Fl,. We used to use Carbon Tec as it was called poured out on the asphalt tile floors to clean off the scuff marks for the weekly inspections and buffed them with a floor polisher. Of course I also now wear hearing aids because we didn’t know that the noise level of the first jets on our aircraft carrier was harmful It was being aware of the spinning propellers that was the main danger.!