In the magic show, the magician left and right hands each hold a black plum poker, two cards gently touch, the magician blew a “fairy”, the original plum pattern instantly became a heart pattern. The color of playing cards in magic is varied, but the illusion or technique is different. In reality, the only creatures that can change color at will are chameleons. But with the advent of “magic dyes,” phone cases, shoes, and cars can all change color and pattern. Next, let’s get to know this wonderful “magic dye”.
The photochromic properties of the “magic fuel” base dye, such as the physicochemical reaction of compound A to compound B when it is irradiated by a specific wavelength of light, and its absorption spectrum changes; Under another wavelength of light, compound B reverts back to compound A.
As early as 1867, scientists discovered that the yellow tetraphene material will fade under air and light, and will return to yellow after heat; In 1952, scientists discovered a class of compounds called spiropyran, which can undergo reversible color changes when exposed to light. In recent years, Chinese scientists have also synthesized more than 100 organic photochromic materials.
For example, Japan has studied a photochromic dye, which can make synthetic fiber fabrics “dye” the color of the surrounding scenery, and melt people’s clothing in the natural scenery; The photochromic dye-acrylic yarn produced in China can transform color with the change of light source after weaving into clothing material.
One change a day, one appearance a day
The magic of photochromic dyes can play an important role in daily life as well as in national defense and military. In daily life, whether it is the customization of small daily necessities such as mobile phone shells, shoes, toys, or the surface decoration of large equipment such as automobiles and aircraft, “magic dye” can be satisfied.
In national defense and military, it can coat warships, tanks and other weapons and equipment with photochromic dyes, and its surface will change color under the light, so that it matches the surrounding environment, so that it is integrated into nature, so that satellites and other reconnaissance means are not easy to find their true colors, to achieve the purpose of cover.
With the progress of science and technology, it is believed that in the near future, photochromic dyes will enter thousands of households and affect People’s Daily life. Maybe one day, a car that changes color while driving will pass you by.
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