full use of his experience, imagination and aesthetic view in setting the copper strips on the body.the third step is to apply the colour which is known as enamel filling. the colour or enamel is like the glaze on ceramics. it is called falang. its basic elements are boric acid, saltpetre and alkaline. due to the difference in the minerals added, the colour differs accordingly. usually one with much iron will turn grey, with uranium, yellow, with chromium, green, with zinc, white, with bronze, blue, with gold or iodine, red. in time of filling, all the colours, ground beforehand into minute powder and contained in plates, are placed in front of the workers and are then applied to the little compartments separated by filigree.the fourth step is enamel firing. this is done by putting the article, with its enamel fillings, to the crucible. after a short moment, the copper body will turn red. but after firing, the enamel in the little compartment will sink down a bit. that will require a refilling. this process will go on repeatedly until the little compartments are finally filled.

　　the fifth step is polishing. the first polish is with energy. its aim is to make the filigree and the filled compartments even. the whole piece is again put to fire. polish once more with a whet stone. finally, use a piece of hard carbon to polish again so as to obtain some lustre on the surface of the article.