Patent Number: 7,101,716

Title: Formaldehyde detecting material

Abstract: A detecting material to detect formaldehyde at low concentration in the atmosphere in a short time is prepared by impregnating a base material containing at least silica gel with a coloring liquid containing 4-amino-4-phenyl-3-ene-2-one and a buffer solution and volatilizing the solvent.

Inventors: Nakano; Nobuo (Tokyo, JP), Kawabe; Tetsuya (Tokyo, JP), Terauchi; Yasuhiro (Tokyo, JP), Suzuki; Kouzi (Yokohama, JP)

Assignee: Riken Keiki Co., Ltd.

International Classification: G01N 33/00 (20060101)

Expiration Date: 9/05/02018