Construction of the ship, as well as the construction of the aircraft - this is a very difficult and responsible process, in which there is no excess of technological solutions. Even painting the waterline in red color has a specific meaning. Many people, however, do not even know why this is being done in our time.
Each solution is important and is not done just so, especially when it comes to vehicles. Have ever wondered about why below the waterline ship-painted red? In fact, everything is quite simple. It started this whole painting in the era of sailing ships. The fact that the bottom of the ship has always attracted a variety of marine life that eat wooden body, thereby destroying it. In order to better protect the structure against the adverse effects of water and its inhabitants, it was decided to apply a protective coat of paint.
Ship master began to use lead-based paint (red lead) with copper oxide. The presence of copper makes used red paint. Painted below the waterline board served much longer. Moreover, the red paint serves another important function - for it can easily be identified in the moment, things are going vessel with equipment and see if it is tilted.
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Gone century, ships were made of metal and to protect the body part is immersed in water all also required. Let the inhabitants of the sea are less of a threat to the metal, but salt water is still very dangerous. Also, watch out for the snap you need today. In our time, the chemical industry has stepped far forward and could use a paint of any color. However ships creators prefer red to the waterline for the sake of tradition.
Note: In the military courts are not always used red color to paint the bottom of the board. Today, in order to disguise increasingly used gray paint special color.
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A source: https://novate.ru/blogs/230819/51488/