Sui Yinzi (Tea Fossils): Ripe Tea Pressed into Nuggets
Among ripe pu'er products, there's a tea of small, irregular nuggets with a glossy surface that looks at first glance like a handful of broken silver, or like fossils. It's called "sui yinzi" (broken silver), and also "tea fossils" (cha huashi).
What Are Sui Yinzi?
Sui yinzi are a reprocessed ripe pu'er: ripe tea material is compacted again, set, dried, and then broken into irregular small pieces. There are a few common materials and methods:
- Made from laochatou: tea heads that formed during wodui are sorted and reprocessed.
- Made from fine ripe tea: bud-rich ripe tea is piled and compacted again.
- With other plants added: the most common is sticky-rice-scented sui yinzi, made with leaves of the nuomixiang plant.
Methods differ from producer to producer. Some put the tea through another round of piling and fermentation so the pieces bind more tightly, which is why they look so glossy and hard.
"Sui yinzi" is an auspicious name based on the appearance, while "tea fossil" describes the hardness. The two names are often used interchangeably for the same kind of product.
Tea Fossils vs. Laochatou
| Laochatou | Sui yinzi (tea fossils) | |
|---|---|---|
| Origin | Clumps that form naturally during wodui | Ripe tea material reprocessed, compacted, and broken up |
| Appearance | Varied sizes, natural shapes | More uniform size, glossier surface |
| Density | Tight | Tighter and harder |
| Aroma | Ripe, jujube, nuo (glutinous) sweetness | Ripe aroma; sticky-rice versions have a distinct sticky-rice scent |
| Releasing flavor | Slow, best in the middle infusions | Very slow, needs plenty of time |
Put simply, laochatou are a byproduct of wodui, while sui yinzi are a product made on purpose. For laochatou, see Laochatou: The Little Clumps Formed in the Pile.
Why Sui Yinzi Smell Like Sticky Rice
Many sui yinzi have an aroma like steamed sticky rice or pandan leaf. These are usually "sticky-rice-scented sui yinzi," and the aroma comes from a plant called nuomixiang, scientific name Strobilanthes tonkinensis, in the Acanthaceae family, found in Yunnan, Guangxi, and Southeast Asia. Its dried leaves carry a natural sticky-rice fragrance, and in Yunnan it's often processed together with tea.
So the sticky-rice aroma doesn't come from added rice, nor does ripe tea develop it on its own. It comes from this plant's leaves. Ripe tea itself can have a little "nuo" sweetness, but that's the ripe sweetness that follows wodui, which is different from the aroma of the nuomixiang plant.
Products with nuomixiang added are pu'er combined with another plant, which makes them flavored pu'er. The ingredient list on the package will tell you. More on flavored pu'er in Chrysanthemum Pu'er, Rose Pu'er, and Sticky-Rice Pu'er.
How to Brew Sui Yinzi
Sui yinzi are very dense, so give them time:
- Amount: 6–8 grams, about 3–5 nuggets, in a 110–130 ml gaiwan or Yixing clay teapot.
- Water temperature: boiling, 100°C.
- Rinse: rinse twice, 5–10 seconds each, so the nuggets absorb water.
- First few infusions: about 20–30 seconds for infusions 1–3. The nuggets haven't opened yet, so the liquor may still be light.
- Middle infusions: once the nuggets loosen, switch to 10–15 seconds. This is when the nuo aroma and sweetness are fullest.
- Later infusions: lengthen with each infusion. Once they fade, they're great for boiling.
Sui yinzi last a long time, and a dozen or more infusions over an afternoon isn't unusual. They also work well boiled or steeped in a thermos. Details are in How to Brew Laochatou and Sui Yinzi.
Storing Sui Yinzi
Like ripe pu'er, keep them somewhere dry, ventilated, dark, and odor-free. The aroma of sticky-rice versions fades gradually over time, so they're best finished within a few months of opening. Store them apart from raw tea.
Who Sui Yinzi Are For
Sui yinzi are small, dense, and long-lasting. Just drop a few into the pot and brew, with no prying. They're great for:
- People who like the sweet, smooth, full-bodied mouthfeel of ripe pu'er.
- People who want to steep tea in a thermos at the office all day.
- People who like boiling tea, since sui yinzi hold up through several rounds of boiling.
If you don't like the aroma of nuomixiang, check the ingredient list when buying and pick plain ripe-tea sui yinzi with nothing added.
FAQ
What are sui yinzi? Ripe pu'er made by reprocessing and compacting ripe tea material and breaking it into small, glossy nuggets. Also called tea fossils.
Are tea fossils the same as laochatou? No. Laochatou are clumps that form naturally during wodui; tea fossils are a deliberately processed product, tighter and harder.
Does the sticky-rice aroma mean rice was added? No. It comes from the leaves of nuomixiang, a plant in the Acanthaceae family. Sui yinzi without it have only the ripe sweetness of the tea itself.
How do you brew sui yinzi? Use boiling water at 100°C, rinse twice, steep the first few infusions 20–30 seconds, shorten once the nuggets open, and boil them in the later rounds.