To find out why, researchers used sophisticated X-ray analyses to determine the exact chemical composition of the paint as it browns.
为找出原因，研究人员用精密X射线分析仪测定了变成褐色颜料的精确化学成分。
Then, I filled up the shelves with all kinds of paint and painting tools. These are the elements I used to give some color on this second composition layer.
然后，我将这些架子上摆上不同的颜料和绘画工具。这些就是我在第二层组合图层中添加的一些色彩元素。
The composition, pick-up and packing, test method of tiny amount of paint for examination at a case crime scene and their application in investigating criminal case are discussed.
论述了刑事案件现场上微量涂料检材的组成、提取与包装、检验方法以及在侦破刑事案件中的应用。
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