A new look at an old question " published in the Journal of Applied Optics. Skin scatters a lot of the red portion of white light before it can reflect off the blood, leaving the blue light to reflect off the blood and back to our eyes. It is a similar effect to how the white sun appears red at sunset due to the blue colors being scattered away by the atmosphere.
Topics: blood , blood color , blue , blue blood , blue veins , color , light , scattering , veins. If you experience green veins vs. There is no issue with your veins being green versus being blue. The color of your veins on the surface is largely due to the undertone of your skin as well as the amount of body fat you have.
What you do need to be concerned about is if it seems like your blue veins are bulging or if they become painful in any way. These are some of the signs of venous insufficiency.
The major signs of venous insufficiency include dilated veins as well as swelling and a change in the color of your legs due to blood pooling in your legs. This leads to inflammation in your skin which can rear its ugly head as:. Ulcers are also a potential side effect of venous insufficiency, which can turn into something quite nasty if not properly treated.
See below for a list of common vein disease symptoms and the visual illustration of the impact different vein diseases have on your body, including spider veins, venous leg ulcers, hyperpigmentation, and more. This ensures that any problems are nipped in the bud at the first sign of problems. Light travels in peaks and troughs.
And the distance between each trough is called a wavelength. Different colours of light have waves of different lengths. Red light has a long wavelength about nanometres , violet light has a short wavelength about nanometres , and the rest of the spectrum is spread out in between. We see something as a particular colour when light of that colour hits our eyes —either directly from a light source or reflected from a surface. To understand what colour our veins appear, we need to think about what happens to different wavelengths of light when they hit our skin, how far they can travel through our skin, and what happens when they get to our veins.
Read more: Curious Kids: Why are rainbows round? The light that hits our skin during the day is basically white, which is a mixture of all the visible wavelengths. But to explain why our veins look blue, we will look at just the red and blue ends of the spectrum.
Red light has a long wavelength — and this means it is less likely to be deflected by materials and can more easily travel through. Red light can travel pretty well through the skin and body tissues, reaching up to mm below the skin, which is where many veins are.
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