Will the writing of thermal label paper fade when exposed to sunlight for a long time?

Long-term exposure to sunlight can indeed fade the writing on heat-sensitive label paper. This is because the color reaction of thermal paper is reversible, and the colored products on it will decompose themselves to varying degrees, resulting in the color of the writing gradually fading until it completely disappears. When the thermal label paper is exposed to sunlight or ultraviolet light for a long time, this decomposition process is accelerated, because the ultraviolet light will destroy the chemical composition of the thermal coating, prompting the handwriting to fade faster.

Specifically, the speed of fading of heat-sensitive label paper is affected by a variety of factors, including:

1.Ambient temperature and humidity: A high temperature and humidity environment will accelerate the decomposition of colored products on thermal paper, thereby shortening the storage time of the writing.

2.Light time and intensity: Long or high intensity light, especially ultraviolet radiation, will significantly accelerate the fading process of the writing.

3.The quality of thermal paper: the quality of thermal paper directly determines the speed of fading. Poor quality thermal paper tends to fade more easily.

In order to prolong the storage time of the writing on the thermal label paper, you can take the following measures:

Store heat-sensitive labels in a cool, dry place, away from direct sunlight and ultraviolet radiation.

Select high-quality thermal paper to ensure that it has good color stability and durability.

For heat-sensitive label paper that needs to be stored for a long time, it can be checked regularly to ensure that its writing is still legible.

To sum up, long-term exposure to sunlight does cause the writing on heat-sensitive label paper to fade. Therefore, when using and saving thermal label paper, it is necessary to pay attention to avoid long-term exposure to strong light, and take appropriate measures to extend its preservation time.