This is a modern old-fashioned thing. I have seen cultural relics unearthed in Shang and Zhou Dynasties. Antiques that are old are not so dirty. They are all old-fashioned and so obvious. (the technique is also poor. This is to coat a layer of glue on the surface of the object first, and then constantly cultivate the soil. After the soil layer and the rubber layer are completely integrated, they will smoke around the chimney for several days. Then it will drill into the ground, water it in a way similar to watering flowers, and take it out a few days later, reaching the appearance of unearthed objects for many years.
But a little too much. The real unearthed objects are all earthy, but they are not beyond recognition, and most of them are permeated with texture, not piled on the surface.
I hope it helps you.