The damage of light to embossed works is very obvious. Especially in the hot summer, for example, a calligraphy painting or a book, let the sun shine directly, it will not be long before it will turn yellow and brittle, and the hand will break when touched, not to mention the embossed painting that we have worked hard to make. On the contrary, if it is stored in rooms and cabinets, the situation is different and it will be much better. Some calligraphy and paintings or ancient books, after thousands of years, look like new, of course, there are many reasons, and light protection is also one of the important reasons.

According to experts, light (mainly natural light) is an electromagnetic wave emitted by a light source, and the characteristics of electrical waves are different depending on the wavelength. Among them, the wavelength below 0.39 microns to about 0.04 microns is called “ultraviolet”, the wavelength between 0.39 microns and 0.77 microns is the “visible light” that people can feel, the wavelength above 0.77 microns to about 1000 microns is called “infrared”, and ultraviolet and infrared are invisible light. In addition to natural light, there is artificial light, and in artificial light, in addition to visible light, there is also a small amount of ultraviolet light.

The destructive effect of light is secondary to the wavelength of light, and the particles of light are called photons, and each photon has a certain energy. Studies have shown that the shorter the wavelength and the higher the frequency of photons, the greater the energy, the stronger the radiant heat, and the more destructive it is; Conversely, photons with longer wavelengths and lower frequencies are less destructive. Therefore, the ultraviolet light in the light is the most destructive to the embossed work, followed by the light, and the infrared light is the smallest.

The main raw material of the embossed work is plants. The plant is rich in plant fiber, and its main chemical components are cellulose, hemicellulose and lignin. As the basic component of plants, cellulose will undergo oxidation reaction in the presence of oxygen, and under the action of light, it will accelerate its oxidation and generate oxidized cellulose that is easy to crush, so that the mechanical strength of flowers and paper (strength, burst resistance, folding resistance, tearing, etc.) is greatly reduced. Even in the absence of oxygen, light has a destructive effect on plants, and ultraviolet rays that drill into the internal structure of cellulose will cut off the long chain molecules that form cellulose, thereby destroying the internal structure of cellulose.

Hemicellulose is a mixture of polysaccharide molecules, which, under the irradiation of light, will accelerate hydrolysis to produce simple sugars such as xylose and mannose that are easily soluble in water. Lignin, like cellulose, is a compound of hydrocarbons and oxygen. Under the irradiation of light, its oxidation process will be accelerated, and the higher the temperature, the faster the oxidation. After oxidation, it turns into brown oxidized lignin, which reduces the strength of the flower material and the backing paper in the work.

It can be seen that the protection of embossed works against ultraviolet rays is urgent.

So how to resist ultraviolet rays?

(1) Paste anti-ultraviolet film. Imported UV protection film is expensive, complex to operate, and those without practical experience have no way to start.

(2) Use anti-ultraviolet glass. The price of anti-ultraviolet glass is higher than that of anti-ultraviolet film, and there are few domestic manufacturers.

(3) Apply a color-retaining UV shield. Embossing special “color retention UV shield” is a special, professional anti-ultraviolet liquid for the protection of embossing works recently launched by the excellent domestic supplier Smart Valley Handmade Classroom. It has obvious advantages in stability, energy saving, durability and other aspects, and after application, it is similar to installing a set of invisible shields for embossed works, which can effectively block ultraviolet rays and make your embossed works retain color for a long time. And best of all: the price is less than 1/100th of the price of the previous two methods!

If you have other methods of UV protection, please leave a message to discuss.