Use oily needle pens (cherry blossoms), and every time you draw a picture, if you have just finished the line draft, use an oily marker, because it is all oily, so it is easy to spend. Unless you repaint it the next night. According to my experience, you can color the reverse side of sulfuric acid paper, or spend some money to go to a large printing shop, and that kind of shop will have a machine that can do many things, such as copying and printing. You can give him your line draft, tell him you want to make a copy, and he will put your drawing into the machine, and it will be OK in 20 seconds. That machine can print any size map, and it can be copied on sulfuric acid paper, and the price is very cheap. A4 is 15 yuan, A1 is 12 yuan.
You can use a marker that will not smudge the photocopying line, which is the oil-based marker of the alcohol series. Secondly, try to avoid repeated outlines of lines when drawing, so as not to cause paper damage. After painting, there must be a certain drying time, do not touch it with your hands.
Generally, large professional landscape companies do this to prevent line drafts from being spent by markers. Some people like to color the reverse side of the sulfuric acid paper. There are several kinds of sulfuric acid paper on the market. One of them looks the same as the high-quality one.
