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.
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.
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
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.
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.
Black pipes are made of iron, which means that they will easily rust. Additionally, the iron will leach into the water, contributing to its mineral content and hardness.
Painted black pipes sandwiched between two layers of glass, have water inside them that is heated thanks to the rays of the sun. Since the color "black" absorbs most sunlight, it's easy to see how black pipes absorb the sunlight and heats the water.
It is generally caused by the building up of sulphur in the pipes if your on a well.
The pipes of solar heaters and the containers of solar cookers are painted black because black surfaces absorb more sunlight and convert it into heat more efficiently than lighter colors. This maximizes the absorption of solar energy, enhancing the overall effectiveness of these devices in capturing and retaining heat. The increased heat absorption helps to raise the temperature of the water or food being heated, making the systems more efficient in their energy use.
Black pipes can be used in furniture design to create a modern and industrial aesthetic by incorporating them as structural elements, such as table legs or shelving supports. The pipes can be left exposed or painted black to enhance the industrial look, and paired with materials like wood or concrete for a contemporary feel.
black iron
Black particles could be caused by corrosion or sediment buildup in the pipes. It is recommended to have a plumber inspect the pipes to determine the source of the particles and address any potential issues. Flushing the pipes may help to clear out the black particles.
Your pipes aren't clean "Dah"