Table 1 Parameters, and corresponding scores, used to define artefacts’ preservation status

Pitting

No pits

1

Visible pitting

2

Completely pitted

3

Preservation of surface

All details visible

1

Details visible

2

Surface partly degraded

3

No original surface left

4

Preservation of shape

Object is complete

1

Some damage is observed

2

Object is partly deformed

3

Object not recognizable

4

Corrosion scale

Not present

0

Present

1