... 10 Properties of TNAP.-TNAP was isolated as stable, high-melting, purple crystals having a metallic sheen Solutions of TNAP in organic solvents are red, and the ultraviolet spectrum of an acetonitrile solution of TNAP Page 2. ... (6) JK Willisma. J. Am. Chem. Soe., 84, 3478 (1962). ...