Artificial dirt, test piece, and preparation method for artificial dirt

The invention belongs to the field of detergent standards, and particularly relates to artificial dirt, a test piece, and a preparation method for the artificial dirt. The raw materials of the artificial dirt comprise vegetable oil, liquid paraffin, wool grease, Arabic gum, white granulated sugar, kieselguhr, alumina, carbon black and distilled water. According to the preparation method disclosed by the invention, by adopting the raw materials with a proper proportioning ratio, dirt common in daily life can be really simulated, the dirt-removing capacities of different greasy dirt detergents can be really and objectively reflected, and the artificial dirt can be used for formulating the national standards or industrial standards; test data is good in the reproducibility and parallelism, and capable of quantitatively reflecting the dirt-removing capacities; the raw materials are wide in source and low in cost; and the preparation process is simple and convenient to operate, and easy to popularize and use.