METHOD FOR PROVING AUTHENTICITY USING NAPHTHALOCYANINE COMPOUND, SIGNAL TRANSDUCTION METHOD, POLYMER WELDING METHOD, METHOD FOR PRODUCING LITHOGRAPHIC PRINTING PLATE, PRINTING INK, TONER, HEAT-SHIELDING MATERIAL, AND METHOD FOR PRODUCING NAPHTHALOCYANINE COMPOUND

摘要

Disclosed is a method of proving the authenticity of goods or a support comprising using a compound represented by Formula (I).wherein, in Formula (I), each of R¹¹ to R⁴⁶ independently represents a hydrogen atom or a substituent group, wherein when a benzene ring is substituted with any of R¹¹ to R⁴⁶, any groups adjacent to each other among R¹¹ to R⁴⁶ may be bonded each other to form a ring; M represents a hydrogen atom, a metal ion, or a group containing a metal ion; and n represents 1. or 2. The infrared absorption efficiency is high and the deterioration in infrared absorption over time is ameliorated. The infrared absorption efficiency is high and the deterioration in infrared absorption over time is ameliorated.