The collection of mahogany furniture has become a fashion in today's society. In fact, the water of mahogany furniture collection is very deep, and newcomers should understand three misunderstandings.
â— Misunderstanding 1: Rosewood has collection value
The so-called mahogany mainly consists of five genera and eight categories, which are divided into red sandalwood, Dalbergia, diospyros, genus and genus. The eight species are rosewood, rosewood, fragrant wood, black rosewood. , red rosewood, ebony, striped ebony and wenge wood. Among them, Hainan Huanghua Pear is the most superior material, very rare. Some collectors tend to over-confident mahogany when they choose, only pay attention to the scarcity of materials and neglect the production process. They think that as long as the furniture made of mahogany has collection value, this view is wrong.
"Jade is not awkward, not a device." The same is true for mahogany furniture. Fine mahogany furniture pays attention to "shape, material, art". The craft and shape determine the collection value of mahogany furniture. The price of the same piece of furniture on the market may differ by a hundred times.
â— Misunderstanding 2: Pursuit of "Ten Tan Nine"
"Ten Tan Nine" originally meant that the large red sandalwood wood is basically hollow, and the yield is extremely low. Correspondingly, the price of a slightly larger rosewood furniture would be surprisingly high.
However, this sentence may not be correct. There are many large table cases in the Palace Museum. The materials used are thick and long. Some cases are more than 3 meters long. The materials used in such furniture cannot be hollow. The red sandalwood displayed in the Shanghai Museum has many large items. .
The red sandalwood is said to have more than ten varieties, three or four that can be seen in China. A few years ago, the first batch of large-scale red sandalwood imported from overseas was almost hollow, and the trunks were straight. It was too far away from the evaluation of the “Ten Tan Nineâ€, but after repeated comparisons, the experts of the Palace Museum finally confirmed the red sandalwood and The pieces of red sandalwood furniture left in the palace of the Ming Dynasty belong to the same kind of wood.
â— Misunderstanding 3: Grimace is the only criterion for Hainan Huanghuali
Many furniture collectors who are just getting started, when identifying Hainan huanghuali furniture, often have a small number of faces and faces on the surface of the material, which is used as the main indicator to judge whether the furniture is good or bad. This method cannot be said to be completely wrong, but it is partial. The huanghua pear that grows in the western part of Hainan Island, due to the sinister ecological environment, has three to four hundred years of talented trees, and the trunk is irregular, the trunk and the tree knot are changeable, and it is easy to form a huanghuali grimace, but this Hainan huanghuali is difficult. Made of large furniture, it is easier to see more faces on many small furniture. Some huanghua pears that grow in the flat areas of the eastern part of the island are relatively straight, the trunks are thicker and the yield is higher. They have very few ghost faces on the surface, but the wavy water is the main ornament, and the color is also Be shallower. Therefore, when distinguishing Hainan Huanghuali furniture, ghost face is not the only criterion.
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Potassium Carbonate, Potassium Bicarbonate and Magnesium Carbonate can be used as pH regulator, nutrient, food additive , pharmaceutical ingridient, yeast, baking powder, swelling agent, additive for beverage, infant formula powder etc.
Sodium carbonate ("soda" or "natron") and potassium carbonate ("potash") have been used since antiquity for cleaning and preservation, as well as for the manufacture of glass. Carbonates are widely used in industry, e.g. in iron smelting, as a raw material for Portland cement and lime manufacture, in the composition of ceramic glazes, in food additive and beverage ingredients, in pharmaceutical raw materials etc..
In aqueous solution, carbonate, bicarbonate, carbon dioxide, and carbonic acid exist together in a dynamic equilibrium. In strongly basic conditions, the carbonate ion predominates, while in weakly basic conditions, the bicarbonate ion is prevalent. In more acid conditions, aqueous carbon dioxide, CO2(aq), is the main form, which, with water, H2O, is in equilibrium with carbonic acid – the equilibrium lies strongly towards carbon dioxide. Thus sodium carbonate is basic, sodium bicarbonate is weakly basic, while carbon dioxide itself is a weak acid.
Carbonated water is formed by dissolving CO2 in water under pressure. When the partial pressure of CO2 is reduced, for example when a can of soda is opened, the equilibrium for each of the forms of carbonate (carbonate, bicarbonate, carbon dioxide, and carbonic acid) shifts until the concentration of CO2 in the solution is equal to the solubility of CO2 at that temperature and pressure. In living systems an enzyme, carbonic anhydrase, speeds the interconversion of CO2 and carbonic acid.
Although the carbonate salts of most metals are insoluble in water, the same is not true of the bicarbonate salts. In solution this equilibrium between carbonate, bicarbonate, carbon dioxide and carbonic acid changes consonant to changing temperature and pressure conditions. In the case of metal ions with insoluble carbonates, e.g. CaCO3, formation of insoluble compounds results. This is an explanation for the buildup of scale inside pipes caused by hard water.
Potassium carbonate (K2CO3) is a white salt, which is soluble in water (insoluble in ethanol)[2] and forms a strongly alkaline solution. It can be made as the product of potassium hydroxide's absorbent reaction with carbon dioxide. It is deliquescent, often appearing a damp or wet solid. Potassium carbonate is used in the production of soap and glass.
potassium carbonate is prepared commercially by the electrolysis of Potassium Chloride. The resulting potassium hydroxide is then carbonated using carbon dioxide to form potassium carbonate, which is often used to produce other Potassium compounds.
Potassium carbonate was historically for soap, glass, and china production.
in cuisine, where it has many traditional uses. It is an ingredient in the production of grass jelly, a food consumed in Chinese and Southeast Asian cuisines, as well as Chinese noodles and moon cake. It is used to tenderize tripe. German gingerbread recipes often use potassium carbonate as a baking agent.
in the production of cocoa powder to balance the pH (i.e., reduce the acidity) of natural cocoa beans; it also enhances aroma.
as a Buffering Agent in the production of mead or wine.
in antique documents, it is reported to have been used to soften hard water.
as a fire suppressant in extinguishing deep-fat fryers and various other B class-related fires.
in condensed aerosol fire suppression, although as the byproduct of potassium nitrate.
as an ingredient in welding fluxes, and in the flux coating on arc-welding rods.
as an animal feed ingredient to satisfy the potassium requirements of farmed animals such as broiler breeders.
Carbonate
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