关键词: 黑色签字笔')">">黑色签字笔, 种类区分')">">种类区分, 溶剂')">">溶剂

Abstract:

We detected solvent component in 24 kinds of black signature pens with GC-MS. We extracted solvent component in black signature pen with methanol as extraction solvent. Results show that 1, 2-propanediol and phenoxyethanol are the most common solvents in black signature pen. Distinction rate is about 50% for the 24 kinds of samples. We further studied the variation rule of 1, 2-propanediol in a short time. 1, 2-propanediol changed to the maximum on the first day of handwriting formation. The variation tends to be stable on the fifth day. The
research provides important evidence for the identification of handwriting formation time.

Key words: solvent, category distinction, black signature pen')">black signature pen