What if the solid wood door frame cracks?

The method of repairing cracks in wooden doors is to repair them with scraps or sawdust cut from some waste newspapers. First, add alum and a small amount of water to the leftovers or sawdust and stir them evenly, then put them into a container and cook them into a paste and stir them. Fill the cooked paste into the gap of the wooden door and smooth it. After natural air drying, it is polished with sandpaper, then filled with the same pigment as the wooden door, and finally painted for protection.