Biohazard

My immediate thought was that this was some of the pigment coming out of the felt. After all, it had certainly never been washed in 45 years but it remains as black as the day it was made.

We've actually talked about storage units and the thing that makes them scary is that you don't ever know what was kept in it before and you don't know what's being kept in the adjacent units. You probably would not have wanted this car for a neighbor.