Application:It is used as a filling in toothpastes. The minor amount of Sn²⁺ ions dissociated from Sn₂P₂O₇ plays a certain role in preventing tooth diseases. It is also used as dying agent in paint and dye industry and used to fine treat pottery soil in pottery industry. In coating industry, adding a certain amount of stannous pyrophosphate can alleviate the precipitation of paint additives in paints so as to improve paint performance.)