“Basically no one uses these two methods now. They require plate making, the screen printing effect is not good, and the concave and convex etching process is troublesome. Now they can be carved directly with an engraving machine, which is fast and good. "--------This friend, I guess you are an engraver. You don't have the final say on what process a sign is made by. If the customer insists on a silk-screen or corrosion-type sign, What should you do? Every type of signage has its own reason and necessity for existence. You cannot exclude market demand just because of various so-called reasons. Having said that, if corroding signs is troublesome just because it needs to be corroded, in fact there are many things in life that are more troublesome than making signs. Since you have chosen an industry, if you can't enjoy the fun, you will never do it well. Furthermore, how feasible is it to engrave stainless steel signs? Your answer is really ridiculous and childish.