[Bill] Since we can't completely rely on the sound, we must also use our eyes.
[Jing] Allow me to add some comment about choosing teapots if I may. Eyes are important but so is the nose. I will develop the idea of nose a bit later although I am sure that a lot of readers know about it already.
[Bill] What we see begins with color. Zisha is directly translated as purple sand. The "purple" part comes from the fact it is the most common raw material color that is harvested. The raw purple color will typically turn to shades of brown after firing. In addition to purple, the other common colors are red (zhuni), green (luni), yellow (duanni), and turquoise (qingni).
[Jing] Zi Sha is the general name of the high quality clay from Yixing, which contains a big part of quartz inside. That is part of the reason why the Yixing Zi sha is more porous than other type of clay/earth. Zi sha is also called “Wu Se Tu” (five color clay) because it includes purple (zi ni), red (hong ni), green (lu ni), yellow (duan ni), and black (hei ni) five colors.
[Bill] Red clay: What has this got to do with the red color? Well, every province will make a lot of teapots in red color, because red is popular with the people. However, many red teapots will not be made of porous zisha clay. These non-porous teapots will maximize the aroma and brightness of tea, but will over emphasize the astringency and bitterness as well.
[Jing] I have to say, not all type of non-porous teapot would over emphasize the astringency and bitterness. The best example would be the local red clay/earth from Chao Zhou, a very native and rough type of red clay. It is used wildly to make teapots but also traditional oven or even tiles. Amazingly, this red clay won’t over emphasize the astringency and bitterness of teas but make it purer. (We could provide picture of this type of teapot for people who are interested in it.)
On the other hand, a well-porous Yixing red clay teapot that was over fired at high temperature won’t brew any good tea , the liquor will be harsh.
[Bill] Therefore, the idea about red colored teapots being suitable only for particular tea styles developed and became a generalization. This concept about red clay was compounded by the fact that from the early 1980's iron was frequently blended in zisha clays to create a rich and attractive red color. The extra iron made the zisha very dense, and was mostly suitable for light aromatic teas.
The truth about red clay: Red clays of pure zisha are suitable for many tea styles. The natural red color of zisha ranges between burnt sienna or red ocher, and displays tones of orange and brown.
[Jing] Originally, why red clay appears in red color is because it contains bigger amount of iron, and that is why generally red clay is naturally denser (and carry a higher ring tone) than other type of Zi Sha. Also, due to the bigger amount of iron, red clay naturally has thinner pores than other types. That is why it is considered as best type of clay to brew high fragrance tea as it can keep the aroma inside better.
[Bill] Red clays can be either dense or porous, without significant correlation to its color. Naturally vivid red teapots of cinnabar and scarlet--though highly demanded--are very rare. These clays were mainly harvested during the Qing dynasty and are very scarce today. If you see a bright scarlet red teapot, it is either a rare find, or it has been created artificially. (I have only ever seen one example, and it was a broken--but treasured--antique).
[Jing] Color is one thing important to real treasure – aged - antique red clay teapot, Other more important things that can be faked easily are the weight and the texture. Although the color of real red clay teapot won’t appear vivid red anymore but deeper with a more profound brownish-red or reddish-orangish-brown color due to its long term using or even naturally aging.
[Bill] Yellow Clay: Zisha translates to purple sand-meaning it is sandy and granular. Yellow clays typically have the most large and coarse granules amongst the different clay colors. This has led many to believe that all yellow clays are hard and not very porous-good mainly for gentle aromatic teas, or mellow teas like cooked pu'er. This is not entirely false. The majority of yellow clays on the market is very dense, and will lead people to believe that this logic is true. However, fine quality yellow clays will enhance the aroma, while pleasantly lighten a teas weight, smooth its body, and concentrate its flavor. It sounds too good to be true, doesn't it? Even though yellow clays are often composed of very coarse granules, the granules themselves can be very porous. So, yellow clays can in fact be used for many different tea styles.
[Jing] Yellow clay contains the softest texture among the five color clays. And, it is the most porous one that is also required the lowest firing temperature among the five types. Because of its natural characteristic, yellow clay is considered as the best type of clay for high (temperature vs. time) roasted teas and puerh teas, which we say it is a clay that can “Cun Qi Liu Xiang” (accumulating the Qi and retaining the fragrance). The most common way of using yellow clay nowadays is to mix it with other type of Zi Sha to increase their sandy texture due to the reason that Bill has mentioned above “Yellow clays typically have the most large and coarse granules”.
[Bill] Watch out for yellow clays that are not fired at adequate temperatures. Yellow clays are most prone to developing black spots and stains from use when they are produced from low temperatures.
[Jing] Yes, and it appears super quickly, only a couple of times of using, the black stains would totally show out and there is no way to retrieval!
[Bill] Purple, Green, Turquoise and other colors: There are fewer generalizations about the effects of other clay colors. Interestingly, because purple is common, and because other colors are rare. Purple is the original and most common color of zisha, so people do not need to replicate its color, and automatically consider it to possess the standard qualities of zisha--even without testing.
[Jing] However, the purple is the most common one, but there is still very few teapots are made by using only one type of pure Zi Ni. Because the finishing color of pure Zi Ni teapot is very hard to master, the color range could be totally different even if the teapots come out from the same firing. That is the reason why most of the purple (Zi Ni) teapots are in fact made with Pin Zi Ni (mixed purple clay – several types of different Zi Ni mixed together to get a more consistent finishing color).
[Bill] Green and turquoise are not as common, but there is little demand for these colors to be replicated, and equally little attention paid to them. When rare colors such as black clay (heini), are artificially replicated, they are made in such small quantities that they cannot create any generalizations in the market.
[Jing] Pure or even purer green and black clay are really rare to get. They are either way a Tiao Sha one (mixed with yellow clay in most of the case) or artificially replicated. Personally, I tend to prefer the first choice. Anyway, if one would like to choose a green or black teapot might want to go with some that carry more natural color tone ones. The more vivid the color is the more added color/ chemistry element is could be. One more experience on the black clay, to choose a better quality black clay teapot, one can go with the teapot that appears the black color is more on the reddish-brownish tone. In most of the case, they are mixed by more natural element and usually fired at adequate temperature and time.
At this point, to choose a good quality teapot, it is important to use our eyes and our nose. They are both as sensitive as each other. By using our nose, we can always smell the clay by pouring boiling water into the teapots. After cleaning the teapot, fill the teapot with boiling water and also pouring the boiling water all over the surface. And now smell. A high quality Yixing Zi Sha teapot should carry hot sandy like smell, which we called it “Sha Xiang” (Sand fragrance). If one smell earthy/muddy then the clay is probably mixed with none Yixing clay or not fired at adequate temperature. If one teapot smells paint or chemical would most been mixed with any of those to increase their color or texture. Another case, one teapot doesn’t carry any smell, well, it won’t be worse than any that is mixed with paint or chemistry element. It is safe to use
If I may go further, there are some exceptional cases of smelling. The most obvious case would be the aged clay from the Yixing Teapot Factory
- Because of their special way of clay fermenting/aging, the clays always carry an unpleasant smell when they are fresh out from the firing - but it is a really typical smell. Once you have smelled it you won’t forget it. However, after 1 week of using/raising this typical smell will be totally gone and the teapot starts to release a light sandy smell. When it would have reached this point, believe or not, the teapot starts to do its job and brew you a really good cup of tea.
Hope this helps,
Jing