Identification of the invoice with the temperature change ink

Temperature change ink ! As the name suggests , the ink temperature change as the temperature changes that will produce a color change , because it is this characteristic , it is used in a number of special items above anti-counterfeiting technology , powdered paint pigments version of the invoice at the Inland Revenue Department in Guangdong it is applied to the temperature change ink !
It was reported that "Guangdong Local Taxation generic fixed invoices " using a special ink temperature change IRD printing "LT" this pattern . At room temperature, this pattern was emerald green , but if you rub with your fingers jammed after heating , driveway stone will change to yellow , then drop back to room temperature, the temperature , but also color changes back to the original emerald green . Due to some kind of temperature change ink IRD -specific, so the move can effectively identify the authenticity of the invoice !