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Black is a color which results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and gray. It is often used symbolically or figuratively to represent darkness. Black and white have often been used to describe opposites such as good and evil, the Dark Ages versus Age of Enlightenment, and night versus day. Since the Middle Ages, black has been the symbolic color of solemnity and authority, and for this reason is still commonly worn by judges and magistrates.Black was one of the first colors used by artists in neolithic cave paintings. It was used in ancient Egypt and Greece as the color of the underworld. In the Roman Empire, it became the color of mourning, and over the centuries it was frequently associated with death, evil, witches, and magic. In the 14th century, it was worn by royalty, clergy, judges and government officials in much of Europe. It became the color worn by English romantic poets, businessmen and statesmen in the 19th century, and a high fashion color in the 20th century. According to surveys in Europe and North America, it is the color most commonly associated with mourning, the end, secrets, magic, force, violence, evil and elegance.Black ink is the most common color used for printing books, newspapers and documents, as it provides the highest contrast with white paper and thus is the easiest color to read. Similarly, black text on a white screen is the most common format used on computer screens. As of September 2019, the darkest material is made by MIT engineers from vertically aligned carbon nanotubes.

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  1. C

    Copper pipes gone black, clean or replace?

    Hi all, I had the house redone about 1.5 yrs ago and all new plumbing was installed. I have plastic pipes in general except copper pipes in the cellar where the boiler and water tank are. The copper pipes have now turned black but the black layer comes off with sandpaper or emery paper. I've...
    • cmpic
    • Thread
    • america black clean copper copper pipes pipes replace usa
    • Replies: 6
    • Forum: USA
  2. T

    black pipe gas elbow or 45

    don’t work. i need something in between to follow outside deck. any suggestions??
    • ted
    • Thread
    • america black elbow gas pipe usa
    • Replies: 7
    • Forum: USA
  3. J

    Does anyone know why an Riello RDB boiler would start pluming black smoke?

    Does anyone know why an Riello RDB boiler would suddenly start pluming black smoke? Does it have anything to do with the needle valve in the fuel pump?
    • jom
    • Thread
    • america anyone black boiler pluming pump rdb riello smoke start usa valve
    • Replies: 23
    • Forum: USA
  4. E

    Separating grey and black water

    Hello, Could you please tell me whether there is any way to create a system that separates grey and black water in a building (residential or other) with an existing plumbing system? (Not a new building) Thank you very much for your reply.
    • Ellilou
    • Thread
    • america black grey usa water
    • Replies: 10
    • Forum: USA
  5. B

    Black valve in image

    Hello, I would like to know going by my image supplied if that black valve is open or closed? I would also like to move it so I can dangle the power cable so it doesn't touch anywhere near that hot pipe. Is it normally left in this position? 1582538148 As you will see I have it pushed out...
  6. S

    Black Specks in Water (only on 2nd floor)

    I'm getting black specks in my water when running hot water, but it is only on my second floor. We have well water with a salt water softener. The specks are more oil-like and smear if I press my finger on them. The specks come out when I run the hot water (hotter the water = more specks). It...
    • speedm1
    • Thread
    • america black floor usa water
    • Replies: 5
    • Forum: USA
  7. M

    Is there such a thing as a black rest bend

    My external foul drains are not deep. If I connect a rest bend then most of it will be exposed. Painting should stop UV degradation but I'm not sure how well the paint will adhere. does anyone make black ones? Would two 135 degree bends connected together make a suitable alternative with a...
  8. R

    Blank required for kuterlite 1700 fitted with black 21.5 o/d alkathene

    I have a kuterlite 'T' fitting with 21.5mm class C black PE water pipe. I need to blank off one port. Can anyone advise what is required please.
  9. H

    What is a black pipe BS1972 we have found 4 inches below ground in our garden?

    Hi, Please could someone provide any advice on what a black pipe with Tenaplas Ltd BS1972 on it, could be? Do you think it is a water pipe, rather than any other utilities? (e.g. telephone, electricity, etc...) We have found it 4in below our garden (we haven't unearthed all of it yet), so don't...
  10. K

    Black, smelly copper pipes in new build (Gloucester)

    hi all, Can anyone explain why my hot and cold water pipes in the cupboard under the kitchen sink have turned black and scaly? I am in a new build (4.5 years old) and there are no other black pipes in the house. The discolouration is accompanied by a horrible smell (gets worse when the...
  11. P

    Black plastic water supply pipe - please help

    Hi, I've only just registered on this forum and hope there is someone out there that can help. I've just dismantled an old kitchen in our house ready for a new one to be installed. In the process, i unearthed a stopcock connected to the incoming water supply pipe which comes up in the middle of...
  12. B

    Water trickling through black plastic connector between two pipes coming from a water pressure tank

    Hello, I’m looking for some advice on water dripping between two pipes coming from a water pressure tank. I’ve attached photos to try show the problem. Basically there’s a steady trickle of water visible through the black plastic connector between the two pipes. I guess it’s also connected to...
  13. CorgiDirect

    It isn’t black Friday, it's orange Friday. 25% Off Regin, Bahco, Dickie Dyer, Monument & Wera

    VIEW HERE
  14. J

    Incoming mains black plastic pipe to 15mm copper

    Hi. Have a mid 1980’s house with the mains water coming in from underground via a black plastic pipe, of which the external diameter is 27mm. There does not appear to be any markings on it, but maybe some faint green. This goes into a 15mm copper pipe via a stop tap with compression...
  15. J

    Black bits that smear in hot water

    Hi guys, We've got a combi boiler system that was last serviced 2 years ago. For the last year or so we've been getting black specks coming through in the hot water when we run the bath. We haven't noticed them in any cold water outlet or hot water in any sinks. At first we thought the issue...
  16. P

    Can I mix orange / brown internally with black grey.

    Orange is cheaper but aware that I can't use outside above ground due to UV but if not seen in a cupboard inside house.... Can I ? Thanks
  17. S

    Dark marks from radiators

    Anyone have any ideas why I am getting dark marks on my walls radiating upwards for about 350mm in line with the radiator mounting brackets and is there a cure.
  18. C

    black specs from taps in water

    Hi all, I have a standard condensing boiler fitted in 2013, BG 330+ I think. Trouble is dirty water is coming out of taps in bathroom. Small little black flecks. Also since this boiler was installed I've become disabled and also looking to get it changed to a combi for instant hot water what...
  19. O

    Black Friday ..... .....

    hi lads Wondering where you guys buy your Black Friday tools ? I am after some tools as longs I can safe a little :) What websites would you recommend ?
  20. Lee John

    Identify pipe... Gas? Or Water? Old black iron pipe.

    Hello! Just wondered if anyone would be able to identify this pipe from a bathroom I'm ripping out - from under bath - next to kitchen (next door). Will probably have to lift boards and investigate - or open the iron plug... and find out...? Anyway, I've attached a photo/s. Any help would...
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