soot-colored remains of soot (coloured)

Exploration Stage: Caramel Boulevard
From: Detective
Description: Of course, the guards didn't see anything. They were switched off. It seems we'll have to solve the case without eyewitness testimony. Let's check out the store where Juliette bought the chestnuts.
Completed: Look, buddy, there are brand new soot marks on every box. Did you forget to wash your hands before packing? The only thing I'm sure of is that someone was here.