Material and methods: The woven wool fabric is a plain-weave 100% (Merino) of 190 g/m2 fabric mass, with warp and weft yarn density of 23 yarns/cm and 20 yarns/cm in this test. TCEP was purchased from
Sigma-Aldrich. Ammonium hydroxide and formaldehyde was pur- chased from the Chinese Medicine Group. Silver nitrate was purchased from Shanghai Institute of fine chemical material. All chemicals were analytic grade reagents, and used without further purification.
Wool fabric was ultrasonically cleaned in ethanol for 5 min and dried at 60 1C before the treatments with TCEP solution. The pretreatment of wool fabric was performed in a water/ethanol (V:V1⁄41:1) solution containing 20 mmol/L TCEP at pH 7.0 for 4 h at room temperature [14]. The solution AgNO3 (35 g/L) was prepared