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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. D

    Worcester Green star 18 ri

    I have recently visited a Worcester green star ri and the blue light is constantly flashing. I have checked the service is in normal mode and that the flue and condensate pipe are not blocked. When I ask for heating or hot water the fan try’s to kick in but doesn’t spin. I don’t really work on...
  2. S

    Green Pak 90 WarmFlow Oil Boiler

    Good afternoon everyone, I hope you're all going to make the most of the sunshine today. For those of you in front of computers, and more technically able that me, I have a few question that if any of you could help with it would be greatly appreciated. I have the above boiler, and yesterday...
  3. GameForkStudio

    Green colour inside copper pipes safe?

    Hi all, I have just changed my kitchen sink tap and this involved cutting the copper pipes under the sink. I noticed a green colour inside the pipes. When I wiped it with a tissue, the tissue became green. Since this is the main house tap and we drink from it, I was wondering if the green...
  4. M

    Green star HE 727 servicing?

    hi folks. I can’t find any service instructions online for the above boiler. Any advice as to where to find some please folks ? Cheers
  5. M

    Worcester Greenstar 28i no green ‘burner on indicator light’ flashing diagnostic light

    Last night our combo boiler got turned off at the mains all night. We noticed this morning when we were all getting ready and plugged it back in. There was no hot water or central heating, the pressure gauge had dropped way into the red, and the burner indicator light no longer came on green. We...
  6. apprentisorcier

    Erratic hot water on new Vaillant EcoTec Green IQ 843, can a TMV or S.40 state be the issue?

    I had a new Combi boiler (a Vaillant EcoTec exclusive green IQ 843) installed a few days ago replacing a previous system one. My flat has 2 bathrooms on two floors with 2 showers and 1 bath. Heating works, and hot water mostly works as well but there's something that kicks in when we shower...
  7. K

    Worcester Bosch Heatslave Green star 18/25 continuously locks out

    Since moving to our property in Dec 2017, the Worcester Bosch Greenstar 18/25 Heatslave, has had a recurring lockout problem, which 3 OFTEC engineers have not been able to diagnose/ resolve. Typically at night when on manual,with no hot water running and with NO HOT WATER demanded of it. The...
  8. J

    Fan fault (red & green flashing) on my alpha HE CB33 and dropping pressure...any ideas?

    Hi guys... I have a alpha HE CB33 and it’s dropping pressure and coming up with error code (blocked flu or fan fault) any ideas?
  9. S

    Green stains on inner surface of WC

    Our house is fed by a spring. The water is soft and so on the acidic side. We had a new upstairs WC and sink fitted. However, over time the WC has gained some green stains down the inside back, where the water flushes down. I am guessing these are caused by the soft water and maybe some...
  10. Scott_D

    Worcester green star 30i

    fitted one this week and it's exactly the same as a Vaillant!! But seriously what a pile of poo
  11. W

    Green Residue on Pipes

    Hello everyone, I apologise if there was a thread regarding this topic. I am a first time renter and I have noticed weird residue on the pipes - could you please shed some light on the subject for me? Is it worrying? I have noticed that the pipes in that area we're wet a couple of month ago...
  12. T

    Mystery green marks on bathroom floor

    Hello to all forum members! Hope that you could share some of your experience and help me solve a little mystery. Perhaps, the title gave you some hints already, but here's what I have found on my bathroom floor after going away for a week: So I had a look underneath and here's what I could...
  13. Scott_D

    Worcester green goooooooooooo

    I see this quite often. This is one I fitted 3 years ago. Green goo on the CH connections, it's not leaking but must have at some point?
  14. EcoSol

    Help needed with valve name.

    Hey guys. I’m designing a new type of renewable energy heating system. I have no plumbing technical knowledge whatsoever so I don’t even know the terms to begin searching for the names of components I need on google- I just know what I need them to do, and that doesn’t bring up search results...
  15. EcoSol

    renewable energy/solar heating technical question.

    Hi guys, I’m designing a new kind of solar heating system. I’m just an amateur and don’t know enough about technical terms to run google searches for pieces of equipment to see if what I need exists, so I was wondering if you could help please? What I’m designing is a solar water heating...
  16. Inverness

    Riello control box blinking red amber green

    worcester heatslave exterior boiler. 3 year old. Oil level in tank is low about 20mm above the Tank outlet. The tiger loop goes crazy with bubbles when i press the lockout button. I bleed the oil pump but nothing, even tried oil gauge but nothing? Checked oil filters are fine. I've cracked...
  17. L

    Gray water system _________

    Hello all, As of late I'm becoming increasingly aware of the amount of clean water I'm wasting by flushing the toilet, I want to create a Gray water system that recycles the water from my shower/bath and then pumps it back to the toilet. So far I'm in the early stages of thinking through this...
  18. M

    First vaillant green iq 627 service of system boiler.

    I have a service for a vaillant 627 system boiler(eco tec pro). For a first service I was told(for 65 quid) you'll need a burner seal . Service and new G10 seal £65 , Thanks Is this correct as to what I need- when he hasn’t checked boiler?
  19. D

    HELP NEEDED!!! Green Bath Water

    Two weeks ago I woke up to find water leaking through my daughters ceiling. Went into the loft and found water leaking from the expansion tank called a plumber and had a new one fitted that day. Thinking all the problems would be sorted and to Bath my children that night to find the hot water...
  20. J

    Question re: Vaillant Combi (ecoTec 835 Green iQ) w/ vSmart Controls

    First post, please excuse my lack of technical knowledge and the length of my post... I recently had a plumber replace a c.30 year-old Potterton Netaheat Electronic 16/22 system boiler with a Vaillant ecoTec 835 Green iQ. The boiler is for a secondary heating system at my property and it...
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