覆盖在嫌疑文件上的色料消除是一个专门的、特殊的研究课题。这些色料主要包括墨水、修改液和铅笔等。我们最常见的是在圆珠笔字迹上用圆珠笔油墨的涂抹。在提交给法庭科学波多黎各研究所的一起案件的嫌疑文件中，有一封两面用蓝色圆珠笔书写的信，其中一面用红色和黑色蜡笔涂 Elimination of colorant covered in suspect documents is a specialized and special research topic. These colors mainly include ink, correction fluid and pencil. The most common thing we do is use ballpoint pen ink on ballpoint pen writing. Among the suspects in a case filed with the Puerto Rico Institute of Forensic Science was a letter written on both sides with a blue ballpoint pen, one of which was painted in red and black crayons