Supermarket receipt paper is the most common thermal printing paper label, generally white. Thermal label paper is a special type of high-grade paper that is coated with certain chemical raw materials so that the paper can change color when exposed to heat without the need for ink or printing ink. Thermal printing paper can be used in thermal printers, which are called thermal printing paper printers, receipt paper printers, receipt printers, etc.

The basic principle of thermal printing paper is to coat an ordinary paper base with particulate powder, which consists of colorless dyes, phenols or other acidic substances, separated by a thin film, which melts and melts when exposed to heat. Under the prerequisite conditions, the film melts and the powder is mixed to cause a coloring reaction. Generally speaking, the colored handwriting on thermal printing paper is unstable and fades easily, making the document content difficult to read. This is why supermarket receipts often have unclear handwriting.