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Why are there words on the wall in the dark?
There are no words at home during the day, and there are words on the wall at night, because the wall is covered with luminous powder, which can also shine in the dark. I believe everyone has seen it, such as luminous sticks, luminous buttons, luminous house numbers and so on. Why does luminous powder glow in the dark? This article will take you to know about flash pigments and color-changing pigments.

Luminous powder is a luminous pigment that absorbs various visible light (sunlight, light and natural light) in unsaturated state and stores light energy, and is activated by rare earth elements in the dark to release light energy, which can be recycled indefinitely. It has many characteristics, such as safety, non-toxicity, no radioactive substance, no harm to human body, good weather resistance, and can be used indoors and outdoors.

Luminous powder is divided into long-acting luminous powder and short-acting luminous powder, the main difference is the length of luminous time, and the luminous time of long-acting luminous powder can reach 12 hours or more (visible to the naked eye). In real life, people use the long-term luminous characteristics of noctilucent powder to make a weak lighting source, which also has special uses in military departments. This material is made into various symbols, components and articles (such as power switches, sockets, fish hooks, etc. ). After these components are lit, they can emit light continuously at night or in case of unexpected power failure, so that people can identify the direction and bring convenience to work and life. Adding luminescent pigments to textiles can make the colors more vivid. Like many fun runners, their running clothes and shoes have fluorescent effects, which can remind drivers and reduce traffic accidents when running at night.

Why does luminous powder glow at night? To sum up, it is mainly because it is a luminescent substance with a special crystal structure, which can absorb light sources, store light energy, and then slowly release it in the form of fluorescence after stopping lighting, so it can still be seen at night.