pH Indicators As Chemical Reagents for the Enhancement of Footwear Marks
pH Indicators As Chemical Reagents for the Enhancement of Footwear Marks
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pH 指示剂作为增强鞋类痕迹的化学试剂
DOI：
10.1520/jfs13891j
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发表时间：
1996
影响因子：
1.6
通讯作者：
A. Zeichner
中科院分区：
文献类型：
--
作者：
B. Glattstein;Y. Shor;N. Levin;A. Zeichner
由于图像细节较差，通常需要增强弱的二维鞋印。硫氰酸盐在文献中被认为是化学增强鞋类标记的最有效的试剂。在这项研究中，我们研究了使用pH指示剂，溴酚蓝和溴甲酚绿色，作为化学试剂，用于增强鞋类标志的可能性。这些试剂在各种表面上的性能，如塑料片，牛皮纸，纸板，陶瓷浴室瓷砖和棉布，与硫氰酸盐试剂进行了比较。结果发现，这些试剂比硫氰酸铵更有效的鞋印样品在以色列的各个地区。阐明了这些试剂对鞋印的化学增感机理。选用1%溴酚蓝和5%水的甲醇溶液作为溴酚蓝的配方，用于鞋印的化学增强。
Enhancement of weak two-dimensional shoemarks is often necessary due to the poor image detail. Thiocyanate is regarded in the literature as the most effective reagent for the chemical enhancement of footwear marks. In this study we have examined the possibility of using pH indicators, Bromophenol Blue and Bromocresol Green, as chemical reagents for the enhancement of footwear marks. The performance of these reagents on various surfaces, such as plastic sheets, brown paper, cardboard, porcelain bathroom tiles and cotton cloth, was compared to that of the thiocyanate reagent. It was found that these reagents were much more effective than ammonium thiocyanate for the samples of shoeprints in various regions of Israel. The mechanism of chemical enhancement of footwear marks by these reagents was elucidated. A solution of 1% Bromophenol Blue and 5% of water in methanol was chosen as the Bromophenol Blue formulation in this laboratory for the chemical enhancement of shoeprints.