Hello, I'm a medical professional with a focus on anatomy and physiology. When it comes to the color of veins, it's important to understand that the appearance of veins can vary depending on several factors.

In general, veins can appear blue or green when they are located closer to the surface of the skin. This is due to the way that light penetrates the skin and interacts with the blood and the walls of the veins. The blue or green color is actually a result of the scattering of light within the skin, a phenomenon known as the Tyndall effect.

However, veins can also appear to be a different color when they are deeper beneath the skin or when the skin is more pigmented. For example, in individuals with darker skin tones, veins may not appear as blue or green because the melanin in the skin can absorb some of the light that would otherwise be scattered to reveal the color of the blood within the veins.

So, the color of your veins can range from blue to green, and may even be less noticeable or appear differently in individuals with different skin types.

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The scientists found that the veins near the surface re-emitted tiny amounts of red light, but lots of blue light. This means the colour blue is more noticeable. The second factor was how much oxygen the blood was carrying. Most of the oxygen in blood is carried by very large molecules called haemoglobin.read more >>