What is pickling? Can I have tea with you?
What is pickling? Can I have tea with you?
Many friends who play with the pot are very concerned about whether the purple clay pot has pickling, and the expression on the Internet about pickling is a lot of complicated not objective and detailed, here let's talk about the pickling of the purple clay pot.
First, what is purple clay pot pickling
Pickling is a method of treating raw material of zisha ore with strong acid such as sulfuric acid in the process of making zisha mud. Because zisha ore contains more iron elements, these iron elements will precipitate on the surface of the pot after firing, affecting the appearance.
The purpose of pickling is to remove iron from purple ore. Sulfuric acid and other strong acids can react with iron to produce iron sulfate and other compounds dissolved, so as to achieve the effect of "iron removal".
Pickling removes iron more thoroughly than traditional physical removal methods. But it also destroyed the natural composition and structure of zisha ore raw materials. This will have a certain negative impact on the quality of the purple clay pot.
Second, why is the appearance of the purple clay pot more beautiful after pickling
After pickling the zisha mud, the surface of the fired pot will be very clean and have no iron spots. This is mainly because pickling removes most of the iron from the raw material.
In the market, many consumers prefer a cleaner, blemish-free purple clay pot. Pickling just meets this kind of consumer demand. The surface of the kettle after firing is clean and delicate, which makes it more delicate and beautiful. This is also the reason why the pickling pot with better sales in the broadcast room is more popular.
However, we can not only look at the outside, but should pay attention to the substantial quality of the pot. Excessive pickling will destroy the natural properties of purple sand raw materials and reduce the quality of the pot. Good on the outside doesn't mean good on the inside.
Third, can the purple clay pot be directly used for tea after pickling
On this point, there is still controversy in the industry. The main concern is whether sulfuric acid will remain after pickling, and whether the residual sulfuric acid will cause harm to human health.
There is little possibility of residual sulfuric acid after pickling. Because sulfuric acid breaks down during high temperature firing.
However, pickling itself destroys the natural composition of the purple sand raw material, which will have a certain negative impact on the quality of the tea.
In good conscience, pickling can indeed improve the appearance of the pot, but there are also side effects:
1. The destruction of the natural composition and structure of purple sand raw materials will have a certain negative impact on the quality of the pot.
2. It may weaken some unique functions of the purple clay pot, such as the effect of removing iron on the seasoning effect of the tea soup.
3. Looking good does not mean you are good on the inside. You should also pay attention to the substance.
Fourth, how to distinguish between pickling mud and raw mud
Whether it is raw ore purple mud, it is necessary to observe the appearance details of the finished pot, and pay attention to two main characteristics: mica and iron melting point.
Raw ore purple mud must be accompanied by mica flakes, and observe that mica flakes are often said to be silver star flakes, which are white dots. What is mica? It is the quartz stone that everyone has seen in real life.
Why does the fired raw ore pot reflect light and show the effect of silver star flickering? Because of the high-temperature crystallization of quartz.
At the same time, it is also necessary to observe whether there is an iron melting point on the surface of the pot, and the black sintering point after high temperature is also one of the signs of raw ore.
Because zisha ore contains iron ore components, so in the mud, generally need to go through a special process to remove the iron ore, but under normal circumstances, iron can not be completely removed, there will always be residue.
So if you find a black dot on a fired pot, it's iron.
Matters needing attention
1. Do not pursue purity too much, and mud with more impurities may be better.
2, especially the section mud, if you buy the section mud is a color, the particles have no other color, it is mostly added particles, the mud is not good, the good section mud is the easiest to judge, that is, the color is rich and colorful, the slope mud is the same.
3, the iron of the pot is often a good thing, not a flaw.
As a purple clay pot lover, we should not be confused by the bright appearance of the pickling pot, and we should make rational judgments when purchasing. For the purple clay pot that has been purchased after pickling, do not worry too much, because most of the early old POTS will also be pickling, and the most important is moderate and transitional grasp!