1. Pick the leaves back. 2. Put the leaves and alkali blocks together and cook for a while. 3. After the leaves are cooked, take them out and gently scrape off the green on the surface with a fine-bristle toothbrush. 4. Only the leaves are left. Remove a transparent leaf 5. Finally, place it in a ventilated place (not too sunny) to dry role. Inside the epidermis are some mesophyll tissues containing chloroplasts that can carry out photosynthesis. Running through the mesophyll tissues are leaf veins composed of conductive tissue and mechanical tissue. Leaf vein bookmarks are made by removing the epidermis and mesophyll tissue and only making them from the leaf veins. You can see on the bookmark that a thicker leaf vein in the middle is called the main vein. The main vein branches out into many smaller branches called side veins; the side veins branch out into smaller branches called veinlets. This is divided again and again, and finally the entire leaf vein system is connected into a network structure. Dye this network of leaf veins into various colors and tie it with a ribbon to make a beautiful leaf vein bookmark. Now let’s introduce the whole process of making leaf vein bookmarks: leathery leaves are usually used, such as leaves of osmanthus trees and leaves of beech plants. The leaves collected should be of appropriate size and should not be damaged. The leaves should be older and should not be too tender. After harvesting the leaves, place them in a beaker (as shown in Figure 1), add 10 to 15% sodium hydroxide aqueous solution (until the leaves are submerged), heat and boil for 10 to 15 minutes (as shown in Figure 2), take it out, and place it flat on a plastic gauze. , rinse with tap water (Figure 3). The epidermis and mesophyll tissue of the leaves are dispersed after the above treatment, and are washed away with tap water, leaving behind the reticular veins. After the leaf veins are rinsed, pick them up and lay them flat on absorbent paper, press them dry and flatten them, and then put them in a dye vat for dyeing.