During editing, he scratched some of the film with steel wool and dragged it around a parking lot to make it appear neglected by wayward projectionists.
If scratched, which is incredibly tempting but detrimental, the skin comes up in weals not unlike a nettle rash, which then burn and take ages to heal.
Toner cartridges can not be refilled indefinitely, because their mechanical parts (such as drums and rollers) eventually wear out and an electro-optical device (the drum) become depleted or scratched.
