Ruby was formed in Majiagou Formation of Ordovician 440 million years ago. It belongs to siliceous limestone, and its mineral components are mainly calcite, mica and timely iron. The hardness is above 4 degrees, and the stone is fine and dense. Judging from the composition and hardness of the stone, it is an ideal material for making inkstone. The rock of Laoya Guzhuang is formed in the contact part of the first and second limestone sections 2-7 meters underground. The rock stratum is thin, the stones are scarce, and there are often time lines mixed in it, so it is extremely difficult to obtain large materials. Every dozens of cubic meters of stone, you get several pieces of HongLing stone blank. Heishan stone is produced in a cave at the top of the mountain. The hole is blocked by stone sand, which is only over a foot high and can accommodate one person to crawl in. This cave is more than ten feet deep and more than ten feet wide, but only three feet high, so it is extremely difficult to squat with your neck bent. Yan You in the Song and Tang Dynasties wrote in Mo Jing: "There is a black mountain forty miles west of Qingzhou, and the mountain is more than forty feet high. There is a hole in the plate, and the stone is born in the west wall of the hole. Legend has it that it is called red silk stone. ..... If you send workers to June 7th, you will only get four or five inches. " It can be seen that stones were extremely difficult to get at that time. At present, the relevant departments in Qingzhou have also made many field explorations, and the stone sources are basically exhausted. Only sporadic stones have been unearthed in the depression in southern Montenegro.
Red and yellow are the main colors of red and yellow, such as orange yellow, purple red yellow silk, pig liver gray yellow silk and so on. At present, most of the red stones in Montenegro are scattered with Venus, and the texture of red stones is endless. Some naturally form moire, water ripple, ice ripple, brush silk ripple and landscapes, vegetation, people, Yunlong, birds and animals. Some also have stone eyes, golden stripes and shiny purple tendons. Some stones have black spots, and when inkstone is inkstone, it looks like ink marks left on inkstone. These silk lines and dots constitute the unique color of HongLing inkstone. The inkstone made of it is moist and smooth, bright in color, like frost by hand, like the penetration of swimming liquid, like oil and paint. Calligraphers Yan Zhenqing and Liu Gongquan in the Tang and Song Dynasties, literati Ouyang Xiu and Su Shi in the Song Dynasty, and Ni Zan and Xu Wei in the Yuan and Ming Dynasties all spoke highly of the red silk stone. Only at the end of the Song Dynasty, due to the exhaustion of Redstone resources and traffic jams, its popularity today is not as good as Duan's and Duan's.