Development of sweat latent fingermarks and formulation optimization of 1,2-indandione on paper
Based on laser inspection photography and control variable method,the development formula of indandione was systematically studied,the formulations were optimised,the influence of adding glacial acetic acid and chlorine salt to the formula on the development effect of fingermarks was further studied.The results showed that the optimal formula was formula:0.25 g indandione,225 mL ethyl acetate,225 mL petroleum ether,25 mL ice acetic acid,25 mL storage solution(0.2 g zinc chloride,30 mL etha-nol),and suitable for domestic climate environment,which had a good effect on the porous objects of fresh and within 20 d of the aged left fingermarks;fingermark fluorescence was significantly enhanced.The ex-perimental results provide a method to follow for optimizing the formulation of indandione fingerprint de-velopment,realizing the colorimetric and fluorescence dual-mode development of sweat latent fingermarks on porous objects.But attention should be paid to the characteristics of the porous object and the control of the amount of glacial acetic acid and the type of chlorine salt.
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