An archaeologist at work excavating brickwork which is covered by a black layer of burnt material
This picture shows a collapsed wall. It is from a Roman building burnt down
by Boudica's army in AD60.
The bright red colour is burnt brick. The Romans made bricks out of mud or
clay which goes red when it is burnt, like firing a clay pot. The black
areas you can see are the burnt cinders of other materials such as wood.