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A secret of the great-buddha Nara which looked from powder technology
You can see the photographs of the buddha in web site:

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A great-buddha Nara in construction

The image of a modern people, standing in a step of this great statue of Buddha, do not changes almost before one thousand two hundred, but the impression to receive is heterogeneous, because we are seeing many big buildings everyday. We cannot know the many pains for the construction. Because we look at a huge building works of the present age by the sense that we got used to imagine to lift by a huge crane very lightly. Could we reproduced the Nara era and tried to think about thing which looked up at a great statue of Buddha by a sense of the Nara era?. I examined the history of the food, and what was the food for peoples participated in construction of the Buddha building. I could not know that at all. A book of casting we can follow a change of construction. At first they were assembled wood, according to it, made a framework and applied a wall in the outside and made a model of a great statue of Buddha with molding mixture of sand and clay. They sprinkle mica powder as separaing materials on this model and they painted the addition with clay sand for outside model and touch it. As for the surface sand which contacted with surface of a model, finer sand was used. Another a little more coarser sand was added for the molding sand, which prepared a grain and painted repeatedly. The thickness was about 50cm. The outer mold divided into piece and calcined this by firewood and charcoal after comletery dried naturally. On the other hand, they cut down uniformly the surface of the model of statue of Buddha, and return it to original place. By this operation they got an uniform opening shaved part. It was statue of Buddha. They pour the melted metal little by little to this place. They divided overall height into eight steps and from the lower part to over parts. Every part built by hand operated bellows smelting furnace. At last, a hill of about 17m high around the outside of a great statue of Buddha as show over picture. To this step, they spend time of 3 yours, but and cast the main body, is still no appearance in this , and is only a rough casting of great statue of Buddha. They must bestow polishing, plate with gold on a surface of statue of Buddha. They took time of 5 years to apply the amalgam which dissolve gold to mercury. To dissolve gold to mercury , which is amalgam,it was need to heating at this time, and the outskirts are full of toxic mercury gas, it was a terrible scene. In addition to construction of the great statue of Buddha, a large-scale enterprise for materials supply was done including a mine of the various countries. "All copper in this country must melt, shave a large mountain, and build a large temple". This was a statement of Emperor Shomu (he was a paramount leader of Japan). It is written even in charcoal used for great statue of Buddha, 16656(180l)3000 cubic m per every construction, This was a greatest charcoal consumption in Japanese history .Because whenever a great statue of Buddha were destroyed by fire by the war . It was rebuilt each time. and reeled it. These was large quantities destroy of the forest in Japan. The result of the forest destroy remaine of Chugoku region in present day. Desertification of the Japanese Islands progresses more steadily since the ancient times already. And a last single blow will going to be added. Old days and now, molding sand are gathered from a sandy beach of white beach sands, and in backstage of brilliant culture. It not touch the culture, burnt , and thrown away. It have sad fate. The modern society turns molding sand of 3-5t into industrial waste to make casting of it. If include sand for glass production as a raw materials, we use beautiful sand per one person good year number of rooms 10kg in my country is calculated. Now a great statue of Buddha of Nara is a huge memory thinking about civilization.