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. M

    Drainage pipes - paving

    Possibly both a plumbing and paving query. See photos:!AutS6uK5ubo1h4wT_dUqy5hsbNNDVQ The single black pipe is my kitchen sink and the other 2 black pipes are my dishwasher and boiler. ----- I had the plumbing done in an emergency as we needed to move in and paving was...
  2. G

    Black oily bits

    Afternoon all. We are getting black oily bits coming from the hot water only in the bath. We have only plastic pipes. Boiler has been checked out and is all ok and in good working order. Can anyone help to get to the bottom with it. My wife is due to give birth in 8 weeks and she can't rest...
  3. M

    Air admittance valve black

    Hi Guys, Just a quick question, I understand the external soil stack regs for a open vented, my customer wants me to fit a air admitance valve on her new stack which i'm putting up. It will be external inbetween two windows . my question is do i have to go past the guttering, for some reason...
  4. T

    Old osma pipe

    Could do with some advice from an old hand in plumbing! Basically, due to some leaks and poor installation in the first place, I need to replace some external pipework, leading from a kitchen sink to a soil stack. The problem I've got is all the existing pipework is Osma 40mm/ 1 1/2 inch...
  5. W

    Grasslin Towerchron QE2 - the black wire not connected

    Happy New Year :smile5: So the heating was coming on all the time. I had a look in the junction box in the airing cupboard and noticed an unconnected wire. Its the black one from the QE2 timer. There is also a live, neutral and earth which are all connected, but the black one looks like its...
  6. Y

    Need help replacing pop-up bath drain plug

    Hi guys, Water has been leaking through the ceiling below the bath. For a while the plug has coroded and the pipe underneath the bath is loose. We have a twist handle pop-up and I'm guessing if I need to change the plug (and fix the pipe below) I need to replace the whole black mechanism? I'm...
  7. A

    Unvented system appears to be losing pressure

    Apologies for lack of proper terminology, I don't know much about this- We recently had our bathrooms re-done, but not sure if this will be related. This pressure gauge seems to lose pressure (black needle has dropped)- When I turn the two little black valves to the left, the black needle...
  8. Chalked

    Ba I megaflo GA black flue terminal

    Got a customer with two of these. They are 3 years old and the terminals were white. He had them sprayed black to match the down pipes, but after a year or so, it's coming off. can you just get the black terminal, like the Vaillant ones. Or will it mean getting two complete black flue kits...
  9. P

    Black Friday powertool deals

    There's some good stuff on FFX like this jacket.. Milwaukee 4939434899XL 2016 BMW Team Fleece Extra Large Same im not XL but its worth bulking out just so I can get it for £20! Roll on the Axminster one, anyone seen ant good deals?
  10. A

    Please help - boiler filling loop problems

    I have an Alpha CB24 combi boiler and it's just given me the red/orange alternate flashing lights. So I've googled the problem and what I need to do is re-pressurise the system; apparently it's an easy fix. But on my boiler, there's only one black switch and I can't make it turn. It moves...
  11. O

    Strange black residue in bath

    Hi, We have a Worcester Greenstar 24i combi boiler which we think was installed in 2010. After taking a bath, we have noticed there are strange black specks/dots left in the bathtub which when rubbed smudge like mascara. The problem only seems to be in the bathtub and only when the hot water is...
  12. O

    Strange black residue in bath

    Hi, We have a Worcester Greenstar 24i combi boiler which we think was installed in 2010. After taking a bath, we have noticed there are strange black specks/dots left in the bathtub which when rubbed smudge like mascara. The problem only seems to be in the bathtub and basin in the bathroom and...
  13. A

    Logic+ 35 no hot water help

    Hi guys in of a little bit of help got a problem with the above boiler giving no hot water. So as you would change the flow turbine that had disintegrated and the magnetic sensor on the top and still know luck but the red neon lights up. Next step was change the pcb so have done that still...
  14. G

    Black 40mm compression waste fittings

    Why is it impossible to get hold of these or am I not looking hard enough?
  15. E

    How to top up Vaillant ecotech pro 28 R2 boiler

    Hi All This is my first post. Please see attached to this post some pics of the set-up of my boiler. The pressure has dropped to 0.8bar and I was trying to top up the system by opening the two taps connected to the silver flexi pipe but that didnt work. I am not sure what I am doing wrong...
  16. U

    End Cap Or Plug For Downpipe

    Hi All. I've a horizontal 65mm square downpipe that needs plugging or capping, preferably without solvent. These endplugs exists: SQUARE PLASTIC BLACK BLANKING END CAPS TUBE PIPE INSERT PLUG BUNG BOX SECTION | eBay but they don't seem fit for purpose as the diameters are wrong. Am I...
  17. J

    Digital Thermostat

    I am thinking of changing from old thermostat to digital. There are 3 wires in old one but only need 2 in digital. The grey wire is not needed what is grey wire for
  18. Lofty24

    Help what's the black thing?

    Been to look at a job but have never seen one of the black things, any help would be great. Thanks in advance
  19. M

    solvent weld Orange 4 inch soil

    Can you solvent weld on to orange 4inch soil. Ie a single ended socket?
  20. B

    Newbie help - repressurising a Greenstar 25si boiler - no key system

    As above, I'm having trouble establishing what needs doing to top up the pressure on our Greenstar 25si boiler. It has recently lapsed into the lower red section.. All the online guides refer to using a white key but the underside of our boiler doesn't have the holes or key to do this...
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