Thanks Coinhi.
I know it's not possible, but would be interesting if we could determine what the dark matter was made of or if it might just be discoloration.
Faintly touching the rim could confirm that it happened before the strike and was pushed up by the upsetting mill.
The lines are even faintly visible in the area between the bust and the rim which, to me, indicates before the strike.
If they occurred after the strike, it doesn't seem like the lines would reach down into this area without causing damage to the bust or rim.
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.