Page 25 - Copper and Bronze in Art: Corrosion, Colorants, Getty Museum Conservation, By David Scott

A
1 "patina" (oxide, sulfide,
grease, lacquer, etc.)
2 sound metal
3 original surface

Β
ι soil minerals, accretions, replaced
organic materials, etc.
2 sound metal
3 original surface
4 mostly cuprite
5 secondary corrosion products,
such as malachite, cuprite,
basic copper chlorides, etc.

c
ι irregular surface with soil
minerals, etc.
2 original surface, now disrupted
3 sound metal
4 corrosion pustule with
cuprous chloride beneath
5 cuprous chloride
6 mostly cuprite with
some copper chloride
7 secondary corrosion products,
such as malachite, cuprite, etc.

F I G U R E 3 Cross-sectional drawing showing variations in the preservation of
copper alloy surfaces as a result of corrosion: , A preservation of shape in
corrosion; , disruption of surface by corrosion; and c, sound metal with patina.
B

I N T R O D U C T I O N
8