Pottery articles
The pottery is made of inorganic materials such as river valley sediments and ordinary clay, which are baked at 800 degrees Celsius to 900 degrees Celsius to harden them. Due to the basic factors such as raw materials, it is characterized by its opacity, small pores and water absorption.
Because the compressive strength of pottery is not high, the firing temperature is lower than that of porcelain. Brittle and brittle is its typical feature. Therefore, it is necessary to prevent the hard object from colliding with it during collection, and also to prevent the between objects. collision. Small items can be stored in the box, and large items should not be stacked. It should be stored in the rack.
Pottery due to its loose texture, has a strong water absorption, while the pottery absorbs a large amount of water, some soluble salts and other impurities will also invade the interior of the pottery. When the temperature changes, the crystallization and dissolution of the salt alternately change alternately. Will make the object more vulnerable. For those unglazed pottery, don't touch it with wet hands or dirty hands. After the pottery is stained, it is extremely difficult to remove. For painted pottery, always pay attention to whether the cemented material in the pigment is aging, and it is found that it is pasted with 10% polyvinyl acetate solution. Due to the high firing temperature, the glazed pottery is superior to the general pottery in strength and fire resistance, but it should be noted that the glaze layer is intact and the salt will enter the carcass in the unglazed place. It can be said that soluble salts are the most important hazards in the collection of pottery. There is no change in the short time, but after a long period of time (2 to 3 years), the watch will be whitened, and its crystals will cause the glaze to peel off. . If the degree of bonding between the glaze and the tire is good, the salt can be washed with water to wash away the salt; if the degree of bonding between the glaze and the tire is not good, it should be fixed with a polymer material and then applied to the washing method. For those old and very fragile utensils that cannot be washed with water, paper-package replacement method can be used to pulverize paper with good water absorption properties (such as filter paper) into pulp and then apply it to the utensils. The substances are transferred to the table and crystallized on paper. Salt can be removed by repeated application several times.
Porcelain articles
The texture of the porcelain is denser and harder than that of the pottery, and it is smooth and not easy to absorb water. The pore walls are small, and the fiber structure contains more glassy state and a certain amount of mullite crystal. The characteristics of these porcelains make light, harmful gases, insect pests, etc. Neither will have an effect on it. However, in the manufacturing process, the porcelain is brittle and fragile due to its own material. Therefore, the most important protection of porcelain is shockproof, anti-squeezing and anti-collision. Small pieces of porcelain must be placed in the box, and one box is required to prevent frictional collisions between each other. The large pieces that are barely placed should be stable, and there should be no hard objects that can be poured down in the surrounding environment. Although porcelain is not afraid of harmful gases, solutions of certain substances are harmful to porcelain. For example, alkali has a corrosive effect on glaze, and strong acid can change the surface gloss of porcelain and make the color change. Therefore, the collection of porcelain must be kept away from pollution sources. Once the porcelain is stained, it can be washed with water, but do not use strong chemical agents to prevent damage to the glaze.
If the porcelain is inadvertently damaged during collection, do not repair it yourself. But you can try those small problems, such as deep bottoming, kiln cracking, and punching. The bottom of the fried base is cracked at the bottom of the machine due to the impact of external force during the collection of porcelain. It is usually more than three, and is radiated and penetrates the carcass. Although the crack will not increase under normal protection, a slight external force will increase until the utensil is completely damaged. For this phenomenon, it can be cleaned first, fixed with both ends of the cotton strip, covered on the fried bottom, and then dripped with concentrated sulfuric acid onto the sliver, the saturation is 80% to 90%, and then sealed with plastic. It is opened every other day, and after repeated several times, it is sealed with an epoxy resin adhesive which is colorless, transparent and fast.
The kiln crack is the gap that occurs during the firing process of the utensil, or in the abdomen of the utensil, or at the bottom, because it is caused by the object itself, and it is lighter than the artificial damage. However, it should be treated. Otherwise, under humid storage conditions, the expansion and contraction of the carcass will be uneven, which will affect its life. The punching is the fine lines of the penetrating wall of the object which are caused by the impact of external force. This phenomenon occurs mostly on the dishes and bowls. This kind of damage is often gradually developed, that is, the crack will naturally prolong, and it will continue to crack under the vibration of external force or the sudden change of heat and cold. Since the cracking is mostly on the table, it can be soaked with "84 disinfectant" during washing, the yellow stain in the punch is leached, and then fixed, the same method as the bottom. In order to ensure the appearance, do not apply too much glue to the watch. Except for the above damages, the rest cannot be used by themselves.
There are many different ways of maintaining the pottery collection and the porcelain collection. The collector must choose the appropriate storage method according to different materials.
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