The pattern on this kind of fabric will disappear as the temperature changes. The principle is thermochromic printing, also known as thermochromic printing. This kind of printing uses heat-sensitive color-changing dyes processed into microcapsules and then printed on the fabric. It can make the color of the pattern on the textile change with the change of the surrounding ambient temperature, producing a unique dynamic change effect. Thermochromic printing can be divided into two categories: reversible and irreversible. Irreversible thermochromic dyes are usually used as temperature detection indicators, while those used for textiles are generally reversible thermochromic dyes. This dye mainly consists of leuco dye, developer and sensitizer (desensitizer). When the temperature rises, the leuco dye reacts with the developer, causing the pattern to show color; when the temperature decreases, the leuco dye separates from the developer, and the pattern becomes colorless again.