Green is the color between blue and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495–570 nm. In subtractive color systems, used in painting and color printing, it is created by a combination of yellow and cyan; in the RGB color model, used on television and computer screens, it is one of the additive primary colors, along with red and blue, which are mixed in different combinations to create all other colors. By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy. Many creatures have adapted to their green environments by taking on a green hue themselves as camouflage. Several minerals have a green color, including the emerald, which is colored green by its chromium content.
During post-classical and early modern Europe, green was the color commonly associated with wealth, merchants, bankers and the gentry, while red was reserved for the nobility. For this reason, the costume of the Mona Lisa by Leonardo da Vinci and the benches in the British House of Commons are green while those in the House of Lords are red. It also has a long historical tradition as the color of Ireland and of Gaelic culture. It is the historic color of Islam, representing the lush vegetation of Paradise. It was the color of the banner of Muhammad, and is found in the flags of nearly all Islamic countries.In surveys made in American, European, and Islamic countries, green is the color most commonly associated with nature, life, health, youth, spring, hope, and envy. In the European Union and the United States, green is also sometimes associated with toxicity and poor health, but in China and most of Asia, its associations are very positive, as the symbol of fertility and happiness. Because of its association with nature, it is the color of the environmental movement. Political groups advocating environmental protection and social justice describe themselves as part of the Green movement, some naming themselves Green parties. This has led to similar campaigns in advertising, as companies have sold green, or environmentally friendly, products. Green is also the traditional color of safety and permission; a green light means go ahead, a green card permits permanent residence in the United States.

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  1. T

    Green Verdigris on PRV

    Hi, I have a PRV located in a heated plant room that is between a pair of stop cocks. It was installed to keep pressure under 3 Bar a couple of years ago but I have noticed an area of verdigris on the piece from the main body to the gauge. I wondered if this might be sign of a leak / trouble or...
  2. Z

    Green on copper pipes

    Just moved into an 18 month old property, and under the sink there is green on the copper pipes, it that normal?
  3. Jrtyson95

    worcester Green star 4000 f-1019 & f2965

    Hi Fitted a new out the box’s boiler today. It worked for 30 minutes. Then stoped and went to fault codes 2965 B Flow temperature too high ▶ System is not filled with water. ▶ No water flow,because CH system is closed. ▶No water flow, because pump is not operating correctly. ▶ Check flow...
  4. A

    Green copper pipes, plumber didn't clean up flux after job

    I'm currently refurbishing a room. Plumber has been in for first fix to lay new pipework for new radiators. He's laid fresh copper pipe, however around the joints they are all green which I believe is flux residue he hasn't cleaned up after soldering. Not the cleanest of jobs but I'm not too...
  5. R

    Green plastic over Glenhill Cylinders

    Hi Just took order of the new Glenhill green envirofoam vented copper cylinder. Unfortunately I did not realise the green cylinder in the pictures was actually a plastic sheet over the insulation. This is going on a kitchen wall and previous one was the spray on foam painted white to blend in...
  6. M

    Green plastic (Qual) oil line discontinued?

    Recently I needed to re-route very old and dodgy oil pipe from tank to boiler. I dug trench and laid a duct and the engineer used green plastic (Pipelife Qual-Oil?) oil line to do the job. Had cause to have boiler manufacturer out to look at something yesterday and he remarked that this Qual oil...
  7. B

    Green star exchanger noise

    Green star oil combi heat exchanger noise day and night water whooshing /gurgling
  8. M

    Green chunks in water??

    We live in the UK in a normal water area, not very hard or soft, and we’ve been having tiny bright green bits coming out of the taps for probably about a year now. They’re kind of chalky when you rub them between your fingers and disintegrate. The house is only 9 years old so seems odd for it to...
  9. J

    Boiler green light off then back on?

    Hi all, I am not sure whether anyone ever saw this issue.... My Worcester Bosch boiler was installed last year August, since then I found the boiler green light (burner light) will be off after HW is satisfied(supposed to be), but after 2 mins it will be back on again! For 2mins of firing, the...
  10. P

    Worcester green star 30si fault

    We have a Worcester green star 30si boiler Hot water is fine. Ch temp is set at 70 degrees but boiler heats to 68 quite fast then takes ages to heat to 72 when it finally pumps round system, Seems to be on constant low burn?
  11. wateece

    Worsted Bosch Green Star 24i won't fire

    Evening We have a Worcester Bosch Green Star 24i that keeps cycling on start up, makes some strange noises the inhibition light turns off and then it starts again until eventually lockout and reset. Reset does nothing but restart the process. Pressure is above 1 bar and in the green. It's been...
  12. I

    Green / Brown sticky substance on combi boiler pipe

    Hi, Does anyone know if this is a problem? Per attached pictures one of the pipes coming out from the boiler (Worcester) has a green/brown sticky residue. Sometimes it will harden, other times like the picture it will soften and slowly run down. Its not water like, more like grease. I have BG...
  13. B

    Green ' gunge ' on pipework.

    Can anyone explain what is happening to the pipework in a relatively new boiler in the attached image?
  14. E

    Green crystals coming out all the hot taps in the house? help please

    Hello, the house was refurbished over a year ago and now we have Green crystals coming out all the hot taps in the house? The water board say it's not limescale These green crystal like pieces are coming out of all the hot water taps and showers: we collect them from the tap filers: there are...
  15. T

    Worcester Greenstar 30CDi info please

    Hi Is the Eco button for the heating of the radiators, or the domestic Hot water? The reason i ask is there is also an E setting on the Hot water control Knob. When i had a Baxi(old house), the domestic hot water always had priority. which seems logical. How does a worcester bosch handle it...
  16. S

    URGENT no hot water of heating

    I have no hot water or heating, my boiler has no error symbols, my cylinder has gone cold, pump seems to be working well it’s making the same usual noise/vibrations, pipe under th boiler are hot but none near the cylinder is! Can anyone help
  17. C

    New Worcester green Star 24ri noise

    Hi all just joined 😃 Last month I had a Worcester Bosch 24ri fitted on my own place it's all registered now and commissioned by a friend of mine (gas Safe) Was all ok until I removed the towel rail in upstairs bathroom which is on the flow and return. This was off for a few weeks while fitting...
  18. S

    Where do I repressure my greenStar 35 CDI?

    Hello, I've just bled my loft radiators and now boiler is low pressure. On looking under boiler, I don't see any obvious key or valve. Any suggestions? Picture of under boiler: Picture of pipework: Any help, much appreciated.
  19. M

    Worcester Greenstar Junior 28i combi boiler - no green light or heating

    Hi all, First of all, I hope I have posted this in the correct place (apologies if not). I haven't used my boiler throughout the summer and have gone to turn the heating on. The hot water is fine and no problems but the green light does not come on my boiler and there is no heat. The blue...
  20. J

    Green pipes?? Sticky residue?? WTF??

    Hi all, I did a LGSC today, on a 1-year-old Worcester combi. Pics attached of the flow and return pipes to the boiler, coated with green powdery but dry residue. And also the pipe tray/cover, which had a sticky green residue. No other issues anywhere. But because it's just the central heating...
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