该方法的目的是估算木屑中天然（木材衍生）污垢的数量。空气中的污垢量 碎屑可能反映在成品纸浆中的污垢水平或生产所需的漂白和筛选步骤中 可接受的产品。通过对芯片进行检查并将其分类为 对最终产品中的污垢水平的最终贡献。对于某些种类的亚硫酸盐浆，污垢贡献值 提供了表（表1），该表允许以基于平方毫米或平方米的指数表示结果 相当于黑色污垢的面积。（参见TAPPI T 213“纸浆中的污垢”）

The purpose of this method is to estimate the amount of natural (wood-derived) dirt in chips. The amount of dirt in the chips may be reflected in the level of dirt in the finished pulp or in bleaching and screening steps needed to produce an acceptable product. The determination is made by examining and classifying chips into categories defined by the ultimate contribution to dirt levels in the final product. For sulfite pulps from certain species, a dirt contribution values table (Table 1) is provided, which allows the results to be expressed in terms of an index based on square millimeters or equivalent area of black dirt. (See TAPPI T 213 "Dirt in Pulp.")