Following a shooting or explosive event, such as the explosion of an improvised explosive device, smokeless powders (SP) and smokeless powder residues (SPR) may be recovered as evidence. The analysis of SPR may allow for an association to the SP, which can provide an evidentiary link. In this study, the correlation between SP and SPR is explored via Sørensen-Dice similarity coefficients and Pearson correlation coefficients. Additionally, the Sørensen-Dice similarity coefficients between SPR and expected pyrolysis products, obtained from the burning of SP compound standards, are explored to determine whether SPR composition may be predicted based on initial SP composition. Results indicated that the similarity between SP and SPR is highly composition dependent, with samples containing diphenylamine along with nitroglycerin or 2,4-dinitrotoluene exhibiting higher similarity scores, as well as those containing dibutyl phthalate. Comparison of SPR to expected pyrolysis products indicated that the ability to predict SPR composition is also dependent on the initial SP composition. The complexity of burning a mixture, such as SP, compared to burning single components may contribute to the generally low similarity coefficients observed in this comparison.

在发生枪击或爆炸事件（例如，简易爆炸装置爆炸）之后，无烟粉末（SP）和无烟粉末残留物（SPR）可能会被回收。SPR的分析可以允许与SP关联，从而可以提供证据链接。在这项研究中，通过Sørensen-Dice相似系数和Pearson相关系数探索SP和SPR之间的相关性。另外，研究了从SP化合物标准品的燃烧中获得的SPR和预期的热解产物之间的Sørensen-Dice相似系数，以确定是否可以基于初始SP组成来预测SPR组成。结果表明，SP和SPR之间的相似性高度依赖成分，样品中含有二苯胺以及硝酸甘油或2，4-二硝基甲苯以及含有邻苯二甲酸二丁酯的类似物得分更高。SPR与预期的热解产物的比较表明，预测SPR组成的能力还取决于初始SP的组成。与燃烧单个组分相比，燃烧混合物（例如SP）的复杂性可能会导致在此比较中观察到的普遍较低的相似系数。