Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass). Another way to put it is that density is the amount of mass per unit of volume.
The answer is repousse. It is a method having to hammer
something from the reverse side to produce relief such as to imprint a design
using the other side rather than using the front side of the metal in which it
is described above.
