Ceramic candle container maintenance method
Ceramic candle container maintenance method: soluble salt removal method.
Soluble salts contained in pottery are related to soil and water. Mainly sodium chloride, potassium chloride, magnesium sulfate and hydroxides of these metal cations. Soluble salts have a certain solubility under certain temperature and humidity conditions. When the temperature and humidity conditions change, the phenomenon of dissolution and recrystallization will occur, making the surface of the utensils white, and the salt crystals support countless small flower spots, causing the utensils The surface is rough, the glaze of the glazed pottery is peeling off, and the interior of the utensils is crunchy and easily broken.
There are no other decorative objects on the surface of plain pottery. Desalination of such utensils is relatively simple, and the washing method is generally used. Put the utensils into flowing water, wash for one or two days, remove a large amount of soluble salt, and then replace it with distilled water for soaking and washing, and use 2% silver nitrate solution to measure the chloride ion concentration in the washing solution to judge the degree of desalination.
Painted pottery materials are painted on the surface of the utensils and combined with the utensils very firmly. For such utensils, the salt can be removed directly by washing. However, there is also a type of painted pottery, such as underglaze multicolored porcelain, painted figurines, etc. The pigment pattern is higher than the surface of the utensils and is very loose. If the salt is removed by washing directly, the pigment will be loose and fall off, so the surface should be cleaned. reinforcement. The commonly used reinforcing agents are 2% nitrocellulose acetone solution, 2% soluble nylon alcohol solution, and 3% ethyl cellulose alcohol solution. When the utensils are reinforced by spraying or brushing, the utensils should be in a dry state. The reinforced utensils can be demineralized by washing, and the polymer materials can be removed with a solvent after demineralization. It can also not be removed, because the polymer material can play the role of protecting and strengthening the utensils.
Glazed pottery The glazed pottery has a higher firing temperature, and its surface is covered with a layer of vitreous lime glaze or lead glaze, so its stability is much better than that of ordinary utensils. If the glaze layer is incomplete, the salt will also penetrate into the interior of the pottery body, and the crystallization of the salt will cause the glaze layer to peel off. If the glaze layer and the utensils are firmly combined, the salt can be removed by washing directly; if the glaze layer and the utensils are loosely combined, they should be reinforced with polymer materials, and the washing method or the pulp wrapping method should be used to remove the salt depending on the strength.