Final answer:
The restorer's ability to restore soot-contaminated surfaces is influenced by the location of the burn line.
Step-by-step explanation:
The restorer's ability to restore soot-contaminated surfaces is influenced by the location of the burn line. The burn line refers to the line on a surface where soot has deposited due to a fire or other source of combustion. Depending on the location of this line, the restorer may need to use different techniques or cleaning agents to effectively restore the surface.