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yellow

Yellow is the color between green and orange on the spectrum of visible light. It is evoked by light with a dominant wavelength of roughly 575–585 nm. It is a primary color in subtractive color systems, used in painting or color printing. In the RGB color model, used to create colors on television and computer screens, yellow is a secondary color made by combining red and green at equal intensity. Carotenoids give the characteristic yellow color to autumn leaves, corn, canaries, daffodils, and lemons, as well as egg yolks, buttercups, and bananas. They absorb light energy and protect plants from photo damage in some cases. Sunlight has a slight yellowish hue when the Sun is near the horizon, due to atmospheric scattering of shorter wavelengths (green, blue, and violet).
Because it was widely available, yellow ochre pigment was one of the first colors used in art; the Lascaux cave in France has a painting of a yellow horse 17,000 years old. Ochre and orpiment pigments were used to represent gold and skin color in Egyptian tombs, then in the murals in Roman villas. In the early Christian church, yellow was the color associated with the Pope and the golden keys of the Kingdom, but it was also associated with Judas Iscariot and used to mark heretics. In the 20th century, Jews in Nazi-occupied Europe were forced to wear a yellow star. In China, bright yellow was the color of the Middle Kingdom, and could be worn only by the emperor and his household; special guests were welcomed on a yellow carpet.According to surveys in Europe, Canada, the United States and elsewhere, yellow is the color people most often associate with amusement, gentleness, humor, happiness, and spontaneity, but also with duplicity, envy, jealousy, avarice, and, in the U.S., cowardice. In Iran it has connotations of pallor/sickness, but also wisdom and connection. In China and many Asian countries, it is seen as the color of happiness, glory, harmony and wisdom.

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  1. B

    Yellow water in cold and hot taps

    Can anyone help me with an ongoing issue I've had since I had an annual service on my combi boiler, which is a Potterton Performa 24. Literally after they left I started experiencing yellow water (pale) from all my taps - hot and cold, including the toilet. This was intermittent and then...
  2. T

    AUS Need to buy Yellow tempering valve cap for Saxon hot water system

    Hey all! 👋 I need to buy one of those yellow tempering valve caps with the triangle inset on top of the lid, so I can adjust the tempering valve on my Saxon 140L hot water service.. it’s only got a crappy blue lid with no triangle inset, and I can’t adjust the valve any other way (difficult...
  3. M

    Yellow water from new unvented cylinder

    Has anyone experienced this before. Converted gravity hot water to new unvented cylinder (150l indirect evocyl) filled the cylinder up and had yellow water for about half an hour before it started to clear. Any ideas from anyone. I’m G3 registered. Was converted due to suspected split coil in...
  4. CorgiDirect

    NEW (Yellow) Serviced By Label WL13 available to order

    NEW (Yellow) Serviced By Label WL13 available to order 32 self-adhesive vinyl labels (100 x 65mm) supplied on 4 sheets of 8 labels in a polybag. Self adhesive labels featuring the Gas Safe Register logo to record appliance service/maintenance details and also due dates for next service...
  5. O

    Aga loud bang then yellow water

    Hi folks I have a gravity feed Aga twice in the last week a very loud bang came out of it, not from the fire box (its oil fired) but from the hot water side i immediately ran the hot tap and the water was yellow for a time then went clear, i am thinking a valve is sticking somewhere anyone had...
  6. Mikesaint

    Worcester Bosch Greenstar 12 Ri yellow cap

    Hi, anyone able to assist naming and tracking down a part for this boiler. It's between the 'mains cable inlet' and the condenser drain. It has a yellow plastic screw on cap which has split and is leaking. Seems a simple part to replace but I can name or find it on any parts site Thanks
  7. M

    Is flame on gas heater too yellow?

    Hi All, The heater seems to be running fine, but I've read around and seen in a lot of places the flame should be completely blue, mine has a bit of yellow in it. I have a new monoxide alarm and its not going off. Thanks so much,
  8. P

    Toilet not leaking, something else.

    He wee's all over the carpet around the toilet and is convinced its the toilet leaking for the foul yellow soup all over the carpet. I told him if the bowl is cracked it would be more or less a continous leak and it would be 99% fresh water but he wasnt having any of it and insists on a new...
  9. finchy01

    Wiring help replacing an old sun vic satchwell sm 3203

    I hate wiring. Never understood it, everytime I think I've cracked it I realise I'm completely wrong! Anyways. I'm sat on a customers landing twiddling my thumbs waiting for sunvic to call back so thought I'd post on here to see if you guys will be quicker! I'm replacing an old sun vic...
  10. G

    Boiler flame very yellow

    My 12 year old Potterton 120L now burns pretty yellow and I can see small flecks glowing red hot on the bottom as I look in the inspection window. I am looking for advise re best course of action. Let it run as it is? Replace the heat exchanger itself? Get the heat exchanger (sealed unit)...
  11. G

    Potterton 120Lv Boiler flame very yellow

    My 12 year old Potterton 120L now burns pretty yellow and I can see small flecks glowing red hot on the bottom as I look in the inspection window. I am looking for advise re best course of action. Let it run as it is? Replace the heat exchanger itself? Get the heat exchanger (sealed unit)...
  12. U

    how to put pressure back up on boiler after radiator put back on

    There is a blue tap and yellow ,sorry I'm not a plumber,just need some advice ,I took radiator off ,and then put it back on ,now I need to put pressure on boiler back up ,but theres no filling loop ,just a blue tap and yellow ,I think the yellow is the gas pipe ,what is the blue ?,thanks ,
  13. S

    Yellow 25mm MDPE to supply garden grotto building - what connectors ?

    Hello CORGI plumbers, Prancer & I want to feed natural gas into the garden grotto outbuilding, from the external underground yellow MDPE 25mm external diameter (20.5 I.D.?) pipe. But we don't know what connector(s), isolators, box, wall plate etc is required to transition from plastic to...
  14. O

    Re: Where can I get a 6m length of yellow PVC soft copper coil ???? who closed thread

    just to clarify I am not diy ing the job I object to being ripped off by so called tradesmen who over charge for parts and cant do the job properly. i.e. they cant bend a pipe because they do not have the correct bender 1) the parts cost me approx ÂŁ140 but as quoted well over this ÂŁ200 plus 2)...
  15. O

    Where can I get a 6m length of yellow PVC soft copper coil ????

    Hello I only need a 6m length of yellow (lpg / gas) 15mm dia soft copper coil ? I do not need 25m plus any ides. Thanks
  16. S

    solvent weld waste fittings/overflow fittings turned yellow

    Thought these only turned a yellow tint when uv hit them? Had some kept in a dark shed for a while in a plastic tub and they have started to turn yellow, especially the overflow fittings.
  17. C

    Strange noise and yellow flame

    Hi, I have an ideal classic ff230 and this evening when the heating came on I noticed a rather loud whining noise coming from the boiler near the top and when I looked in the little inspection window, the flames were yellow rather than blue, so I have immediately turned it off and phoned the...
  18. S

    3 port on under floor yellow light blue valve

    I need to replace a 3 port on an underfloor circuit. its blue and has a yellow light on top of the box. does anyone know the make of valve and if I can replace with a standard 3 port? thanks
  19. H

    Advice

    What is the best advice you've been given/given yourself that you were glad of?
  20. S

    Yellow Hot Water after boiler inspection??

    Hoping someone can shed some light! had the boiler serviced on Thursday morning- ( Condensing boiler circa 2010 original to the apartment) this morning noticed no hot water and yellowish tinge to the water as well. water pressure is fine and on resetting the boiler switch and putting on to...
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