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Information about Ceramics
1, Ways of Selecting durable and nice porcelain:
a, Principles of purchasing:
You need to give priority to the products with clear brand and produce. The products which have often white porcelain enamels are often high transparent, heat resistant, impact resistant and waterproof. There are two types of porcelains, household goods toward hygiene and decorative handicrafts toward aesthetic elements

 Once selecting, you should use your fingers to touch porcelains, if it creates clarity sounds, it is good quality. Conversely, if the calls are not clear or ripple on products, products are inferior quality.

 When you buy ceramic bowls, jars, plates, you should overlap them together or on a flat surface to check whether there are product gaps, how the roundness and distortion is .if the balanced product will not be inclined or curved, offset.
 Pottery and ceramic are made from clays but is quality ceramic and porcelain is different because of selection of materials, additives and manufacturing processes. So you need to distinguish between porcelain and ceramic objects. Porcelains are heavier than potteries. Porcelains have clear sounds and waterproof. Ceramics are also light, easily porous, friable and absorbent, muddy sound. Ceramics are heated from 800 -> 1200 degree C, while porcelains are heated to 1300 degrees.
You should observe the surface of things to check if there is the brightness, dull of enamel colors, dark and light of drawings and black spots, cracks.
With bowl meal, please choose types with a high base to avoid burning and holding is easier than that of low base

Porcelain utensils after using need cleaning. Use a thin piece of foam to wash lightly. Don’t rub strongly because this way makes objects scratched. If porcelains are used for decorating, you should avoid places where the sun shone on to spoil things

b, Things to avoid when buying ceramics:
There are some ceramic products harmful to human health because they are decorated with pigments. The pigment contains a certain amount of lead metal; lead has adverse impacts on the hematopoietic activity, nerves, spleen and organs, blood and optical functions of other organs of man. When people absorb a certain amount of lead will lead to the phenomenon of vomiting, nausea, abdominal pain. So, when using ceramic, porcelain, you should the following notes:
- Porcelain products originating from China which have the lead and Cadminium are toxic to consumers when using for a long term.

- When buying potteries for usage (containing food and drink), you should not choose the things drawn on the outside enamel, especially to avoid all kinds with colors. You should choose products are decorated on the bottom of the enamel or in enamel. Blue flower ceramics which are decorated green color in the enamel or the bottom of the enamel are very popular

- Products contain glossy enamel, sharp patterns and colors should not be selected by the calcinations temperature of the product not meet quality standards, so there are many impurities in the product.

-Ceramics must be submerged in the vinegar 4% so as to eliminate a large portion of toxic substances to help reduce potentially harmful in ceramics to health

- Do not use ceramics to contain acidic food and fruit drink, wine, coffee in a long time. Because when ceramics contain these things in the long time, higher temperature will release the lead, which increases the side- effects of lead poisoning liberated.

c, How to preserve and clean the pottery:
* How to clean:
Ceramics for displaying or using for a long time often have the stains stick on and they looks not nice. There is an easy way to clean old potteries again:

For stains in porcelain is usually caused by scratches, dust for a long time. You need get salt and vinegar dissolved by 1:1 ratio and then boiled to dissolve salt. Use a damp towel to cover with the stains at a time and then get a rather rough towel to absorb with vinegar and clean strongly, stains will end. With rough porcelains, you should dissolve soap with water, drop porcelain in and use a soft brush to scrub stains.
* How to preserve
having been used for long time, ceramic utensils is often dirty and dark color. The following methods will help make new ceramics again:

With the drinking cup, jar, bottle, you should fermented flour which is used to make bread mix with water, wipe the surface of things at once. After the time, use soft to clean again. The utensils will be shining for several weeks.

Absolutely should not use the dishwasher to wash ceramic or porcelain things decorated with flower, because this way can easily fade the patterns

Wash utensils with hot water and wash with detergent water (a mild detergent). More carefully, you should put them in plastic pots lined at the bottom with an on lay to avoid being broken in cases that utensils can be slipped your hand. Wash the second and the third again by the same temperature and use a clean and soft towel to dry before storage.

Do not use fabric absorbed with Javel to clean utensils or ornaments in modern ceramics, they will be scratched much

To repair a crack or scratch on pottery, firstly, wash things carefully by hands lightly with water (mild detergent ), then dry with hair-dryer. If the pottery is thick, slit further cracks and then paste them with epoxies. Finally, dry with a towel dipped in alcohol and tie the cracks with string at least 24 hours
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