本规程用于识别会使金属板失去光泽或污渍的纸张和纸板。报告样品试样出现的金属变色、污渍或腐蚀，以及变色或污渍的分布。可还原硫活性是导致变色的常见原因。这种做法以前是一种专门用于银变色的官方方法，其他类型的金属板被称为修改版。本规程扩展了测试范围，并明确指出该程序旨在进行定性评估。某些样品类型，如防水纸或金属涂层纸或纸板，可能需要修改测试程序。 在大多数情况下，可以在不润湿试样的情况下，通过将试样与板之间的接触时间延长至至少24小时来测试防水剂或金属涂层试样。测试此类试样类型时，请在报告中说明对实践的任何修改。本标准实施规程中涉及的原则可用于测试各种金属（如钢、铜、镍、黄铜等）的变色、染色或腐蚀性能。有必要使用特定金属或合金的板材或模板，并根据特定目的进行其他必要的修改。例如，如果金属生锈，纸张可能不会被弄湿； 它可以在高湿度的环境中加热。本标准实施规程不包括纸张样品变色、染色或腐蚀测试的具体程序。本规程描述了采用本规程生成的报告的程序框架和所需包含的信息。

This practice is for identifying papers and boards that will tarnish or stain metal plates. The appearance of the tarnish, stain, or corrosion of metal by a test specimen of the sample is reported, together with the distribution of the tarnishing or staining. Reducible sulfur activity is a common cause of tarnishing.This practice was formerly an Official Method specific to silver tarnishing, with other types of metal plates referenced as modifications. This practice expands the scope of the testing and clearly indicates that the procedure is intended to be a qualitative evaluation.Certain sample types, such as water repellent or metal-coated papers, or board may require modification of the test procedure. In most cases, water repellant or metal-coated samples may be tested without wetting the test specimen and by prolonging the time in contact between the sample and plate to at least 24 h. When such sample types are tested, state any modification of the practice in the report.The principles involved in this standard practice may be used to test paper samples for the tarnish, stain, or corrosion properties with respect to a variety of metals, such as steel, copper, nickel, brass, etc. It is necessary to use plates or forms of the particular metal or alloy in question and to make other modifications as may be required for the particular purpose. For example, in the case of metal that would rust, the paper might not be wetted; it could instead be heated in an atmosphere of high humidity.Specific procedures for testing for tarnishing, staining, or corroding paper samples are not included in this standard practice. This practice describes the procedural framework and the required included information of a report generated by employing this practice.