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Color (American English) or colour (Commonwealth English) is the visual perceptual property corresponding in humans to the categories called blue, green, red, etc. Color derives from the spectrum of light (distribution of light power versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Color categories and physical specifications of color are also associated with objects or materials based on their physical properties such as light absorption, reflection, or emission spectra. By defining a color space colors can be identified numerically by their coordinates.
Because perception of color stems from the varying spectral sensitivity of different types of cone cells in the retina to different parts of the spectrum, colors may be defined and quantified by the degree to which they stimulate these cells. These physical or physiological quantifications of color, however, do not fully explain the psychophysical perception of color appearance.
The science of color is sometimes called chromatics, colorimetry, or simply color science. It includes the perception of color by the human eye and brain, the origin of color in materials, color theory in art, and the physics of electromagnetic radiation in the visible range (that is, what is commonly referred to simply as light).

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    Logic Combi 35 losing pressure

    Hi folks, I'm a customer who has a 3 year old Logic Combi 35 in my house that has been losing pressure regularly since the new year. At first it was every 3/4 days but I tried adding a leak inhibitor which delayed it to every 7 days, but after a couple of week it returned to every 3/4 days...
  2. M

    15mm Copper Gas Pipe Length

    I'm having my kitchen refurbished and wish to place a gas 'range' on an external wall for ease of venting as opposed to what I already have with a electric ceramic hob/oven on an internal wall. My current copper pipework runs outside my property from the meter in the garage (where the combi...
  3. D

    Quote?

    Hi, I have a quote to replace my (very) old traditional boiler with an Ideal Logic + combi (in the same place), including power flush (2 bed terrace house - 5 rads including bathroom towel rail), and to remove the old water tank and all pipes etc. Quote is £2.3k. Does that seem about right?
  4. V

    Fix Shower they said......

    Fix leaking shower they said.... 10min fix they said ..... Plumb center do NOT keep parts for an 1874 Shanks mixer ....grr And no I didnt do the copper pipework...will fix it though ;)
  5. G

    water mains upgrade

    When upgrading the mains do thames water upgrade from the stopcock on the road to the house (pre laid pipe) or do they upgrade the communication pipe from the main supply to the stopcock and from the stopcock to the house? Im thinking if you upgrade the water mains to larger pipe size are...
  6. A

    Which toilet for this type of connection

    I've just removed a leaky old S bend toilet from a downstairs loo. It connected vertically to the floor and I'm not sure which toilet and connector to go for. Ideally I'd like a close coupled toilet so that we can get rid of the overflow but not sure if/how that will work with the position of...
  7. H

    Oil Rayburn 480 kb balanced flue high CO

    Any advice much Appreiciated. I was called to Rayburn 480kb its Eco Flam >2001 customer complaining about fumes smell lock out. I Serviced and set up as below after Striping cooker burner and adjusted setting No signs of damage in chamber replaced new burner seals flue readings i now set to...
  8. I

    Bath mixer tap problem

    Hi all, I have a problemwith the hot water from my bath tap. Thetap is a mixer type and the cold water works fine. I’m also getting hot/cold water from thesink. I’m not sure whatthe problem is, i.e. does the tap need replacing or the does the spindle needreplacing. Can anyone advise me...
  9. H

    Secondary Heat exchange cleaning

    Hi Guys. Need some Help. Ideal Logic combi 24 CH works but no DHW, the guy told me to use "one shot" which I found to be drain cleaner(91% sulphuric Acid). I have put Sentinel X400 into the heating system and will also use X100. How will I know which is the CH holes and which are the DHW...
  10. M

    Gravity System Advice

    Hi guys, doing some renovation work in my downstairs bathroom and need some advice. Since being in this house there has always been a radiator half way up the downstairs bathroom wall. I've found out by taking back some false wall that this radiator is joined to the gravity hot water circuit...
  11. J

    Boiler not firing up sometimes

    I put this problem to the forum 3 weeks age and everyone said I should get the installer back. I did that and he could not find a problem. I also had British gas out twice (I have a yearly maintenance contract with them) and the first man changed the motor on the Honeywell 3 port valve -...
  12. U

    Waste Manhole

    (New to forums and not a plumber) My mother-in-law has just popped round in a fluster. Apparently her next-door neighbour has had a builder round to discuss installing a new en-suite bathroom. As part of his checks he lifted the manhole cover outside their homes (they live in a terrace) and...
  13. M

    Old Warmflow combi hot water flow switch alternative to over priced 1476 switch

    Hi I guess lots may already know this but I was a bit shocked looking at the ridiculous price of the 1476 flow switch folks might find it helpful to know that the Worcester 87161207400 which is brass bodied and half the price fits and works no problem. Not sure of connector matching but hey it...
  14. H

    Glowworm Flexicom 30CX combination boiler Heat Exchanger problem?

    Hello, I am a female and single and at the mercy of some unsrupulouse plumbers. I have hired two and there are problems. I really need some advice. Here is the story. 1. January. Boiler failed, no power, plumber 1 attended replaced pump new part, he said was a pump but no power on pcb...
  15. T

    Grab Your New 17 Plate Van Now with Vansdirect!

    If you have any questions on the offers available, please drop me an email at [email protected] or complete a Contact Us form on the Vans Direct Website
  16. M

    combi boiler leaking (slow drip)

    Hi all, Hopefully someone can help me with this. I seem to have a slow drip coming from this pipe (see pic) Any ideas on what the pipe is for and how to fix it? if my boiler is due a service can I get it fixed at the same time? Thanks
  17. C

    Combi Boiler - low hot water pressure

    We have a combi bolier fitted and the hot water pressure is abysmal. United Utilities have tested the water supply and confirmed that the pressure is 2.5 bar and the flow rate is 16 litres per minute. If you turn atap on downstairs, flush the toilet or use the washing machine, the flow to the...
  18. N

    Siemens RWB2E slider switches

    Hello, We've been having a few issues with the central heating control unit. Last night I finally got round to reading the instruction manual but when I attempted to use the control unit (siemens RWB2E) the slider switches are completely stuck and will not move. We have been able to put...
  19. T

    SAVE £1,000's on a New Van NOW!

    Vansdirect Clearance Sale Large selection of vans in stock, with free delivery in up to 5 days! If you have any questions on the offers available, please drop me an email at [email protected] or complete a Contact Us form on the Vans Direct Website
  20. S

    Worcester 24i greenstar junior locks out

    Hi all I'm wondering if anyone can help with any suggestions on a very frustrating problem We moved into a house about 2 years ago and it had the greenstar 24i junior feeding a mega flow. Randomly, the boiler would lock out - the blue, reset and eco light flash in sequence. As soon as you...
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