Why are sunsets red?

Sunsets often have a red or orange color to them. Why is this? Sunlight (what we call "white light") is made up of all different colors of light, each having a different wavelength. During a sunset, more red light is scattered toward you because of aerosols in the lower atmosphere, compared to the amount of blue or green light. Since, at sunset, sunlight is passing through a much longer path of the lower atmosphere than when the sun is overhead, the effect of the aerosols becomes much stronger. So, you end up seeing more red light that any of the other colors of light, and the sky appears red.

Why are lips red?

First of all, did you know that the outline or the border of your lips (called the vermillion border) is a special feature of humans only? This transition line from your skin to the pinkish-red part of your lips is found only in humans—no one knows why.

The lips appear red because of the underlying blood vessels. Arteries are blood vessels that carry blood back to the heart. The arteries and veins are connected through a series of blood vessels called the capillaries.

These red-colored blood filled capillaries are close to the thin skin on your lips, so your lips appear red.

Why are fire trucks red?

The most widely-accepted reason that fire engines are painted red dates back to the 1800s -- a time when there was a lot of competition between the fire brigades of neighboring cities and towns. The firefighters of each brigade took great pride in their pump. Each brigade wanted their rig stand out by being the cleanest, having the most brass, or being a regal color. Because red was the most expensive color, that's what color most crews chose to paint the pump.

Other sources cite the tradition of painting fire engines red going back to the early 1920's. Henry Ford wanted to make cars as inexpensively as possible and only offered cars in one color: black. With all of these black vehicles on the road, the fire service began painting their vehicles red in an effort to stand out.

Today, just as you have many more choices of colors available to you for your vehicle, so do the fire engine manufacturers, and it is not uncommon to see white, yellow, blue, orange, green, or even black fire engines, in addition to red. And while some studies hint that colors such as lime-green may be more visible to the public than traditional red, the vast majority of fire departments continue to use red fire engines -- a color instantly recognized by everyone as that of a fire engine.

Most recent fire engines purchased have shifted to the Chicago-famed, black over red paint scheme. The first closed-cab chief's cars in Chicago had black canvas tops which would not take paint. Someone among the brass liked the appearance, so as new closed-cab apparatus came onto the roster, the cabs of the fire engines were painted black.

You may also notice the green light on fire engines in northern states. This is also a traditional Chicago-style fire engine feature. Commissioner Albert Goodrich of the Chicago Fire Department (1927 - 1931) had a nautical background. He applied the marine scheme (red light on port, green light on starboard) to fire apparatus, and the idea became a tradition of the Chicago Fire Department. It is also used to mark the bay doors at most Chicago fire stations

Why are barns red?

If you've ever driven through a rural area, it's likely that you've seen the red barns that speckle the farming landscape. There are several theories as to why barns are painted red.

Centuries ago, European farmers would seal the wood on their barns with an oil, often linseed oil -- a tawny-colored oil derived from the seed of the flax plant. They would paint their barns with a linseed-oil mixture, often consisting of additions such as milk and lime. The combination produced a long-lasting paint that dried and hardened quickly. (Today, linseed oil is sold in most home-improvement stores as a wood sealant). Now, where does the red come from?

In historically accurate terms, "barn red" is not the bright, fire-engine red that we often see today, but more of a burnt-orange red. As to how the oil mixture became traditionally red, there are two predominant theories:

Wealthy farmers added blood from a recent slaughter to the oil mixture. As the paint dried, it turned from a bright red to a darker, burnt red.

Farmers added ferrous oxide, otherwise known as rust, to the oil mixture. Rust was plentiful on farms and is a poison to many fungi, including mold and moss, which were known to grown on barns. These fungi would trap moisture in the wood, increasing decay.

Regardless of how the farmer tinted his paint, having a red barn became a fashionable thing. They were a sharp contrast to the traditional white farmhouse.
As European settlers crossed over to America, they brought with them the tradition of red barns. In the mid to late 1800s, as paints began to be produced with chemical pigments, red paint was the most inexpensive to buy. Red was the color of favor until whitewash became cheaper, at which point white barns began to spring up.

Today, the color of barns can vary, often depending on how the barns are used.