Decoppering
Decoppering is the act of removing copper and it is most commonly used in the context of the removal of copper residues from the rifling of gun barrels.

Decoppering agents are frequently added to smokeless powder propellants. Decoppering is most important for large guns (especially naval guns), but the additives are used even in medium and small caliber guns.

The most common decoppering additives are:
* Tin metal and compounds, e.g. tin dioxide
* Bismuth metal and compounds, e.g. bismuth trioxide, bismuth subcarbonate, bismuth nitrate, bismuth antimonide; the bismuth compounds are favored as copper dissolves in molten bismuth, forming brittle and easily removable alloy
* Lead foil and lead compounds, now phased out due to lead toxicity
Q753
copper
Concept
Q228268
rifling
Concept
Q487192
gun barrel
Concept
Q901722
smokeless powder
Concept
Q1364934
propellant
Concept
Q511450
naval gun
Concept
Q1096
Tin
Concept
Q129163
tin dioxide
Concept
Q942
Bismuth
Concept
Q252536
bismuth trioxide
Concept
Q2983022
bismuth subcarbonate
Concept
Q804151
bismuth nitrate
Concept
Q25304545
bismuth antimonide
UNK
Q898288
brittle
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Q37756
alloy
Concept
Q708
Lead
Concept
Q5249592
Decoppering
UNK
Q5249592
Decoppering
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Q5249592
Decoppering
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part of