Copper pipes will turn black if the cold water running through them constantly condenses. You will see this happen most often during the summer months.
I think copper pipes are painted black because, the black paint helps absorb e.g. sun light therefore passing the heat energy trough the copper pipe...i think
Drain pipes are often painted black because black absorbs heat, helping to prevent freezing and thawing during colder months which can cause pipes to crack or burst. Additionally, black pipes blend in with the surroundings and are less noticeable.
Oxidation
Well, it's really a great questions. As for the black pipes, it's because during the manufacturing process, some materials are added to pretect the pipe, ususlly to anti-UV. In most cases, those pipes that re under the ground or the wall, there's no need to add black materials, and these pipes are ususlly the original color of the ingredients of pipes. Justi like RIIFO's PPR pipes that are usually green.
Pipes are often dull black due to the oxidation that occurs on the surface of the metal. When exposed to air and moisture, the iron in the pipes can react with oxygen to form iron oxide, giving them a black appearance. Additionally, pipes are often painted or coated with a black finish for corrosion resistance and to protect the metal from environmental factors.
Copper pipes will last the longest. anonymous@oola.com
Copper is used as hot water pipes because the copper will not corrode when the hot water goes through the pipes
Copper is used as hot water pipes because the copper will not corrode when the hot water goes through the pipes
Copper 99%
No, copper is a metallic element.
=== === By the way I doubt very seriously your using copper pipes your using copper TUBING
Galvanized pipe will be silver/gray color. Copper will be copper. Use a magnet, it'll stick to galvanized pipe but not to copper. Drinking water lines should not be black steel pipe.