Ru Porcelain (Ruyao)

Learn More About Ru Porcelain (Ruyao)

What is Ru Porcelain?

Ru Porcelain, or Ruyao , is one of the most esteemed types of Chinese ceramics. It originated during the Northern Song Dynasty (960-1127 AD) and is famous for its smooth, jade-like glaze with a delicate network of crackle patterns that develop naturally over time. 

What makes Ru Porcelain special?

Exquisite sky-blue glaze – A soft sky-blue glaze that resembles the color of the sky when rain stop and the clouds break.

  • Unique crackles （Kaipian) – Natural fine lines that enhance with use.
  • Soft and warm texture – Unlike ordinary porcelain, Ruyao has a silky, warm touch.
  • Historical significance – Once reserved for imperial use, making it highly valued today.

What is crackles（Kaipian）?

The crackle patterns in Ru Porcelain glaze are known as "Kaipian" . Originally, this was considered a defect in pottery (commonly referred to as "crazing" in ceramic terms), but Ruyao transformed this flaw into a signature aesthetic feature. These patterns form naturally during the firing process and cannot be precisely controlled, making each piece truly unique.

 Why does Ru Porcelain develop crackles?

  • Kaipian occurs due to differences in expansion rates between the clay body and the glaze:
  • During firing, the ceramic body and glaze shrink at different rates.
  • Upon cooling, the glaze contracts more than the clay body, resulting in a network of fine cracks.
  • Over time, exposure to tea and air enhances the crackles, deepening their color.

Are crackles a flaw?

No! While originally considered a defect, Ru Porcelain turned this into an artistic advantage. The fine lines give the Tea ware a unique aged appearance and allow it to develop a beautiful patina over time.

What Are the Types of Ru Porcelain Crack Patterns?

TYPES OF CRACK PATTERNS IN RU PORCELAIN

How to Care for Ru Porcelain?

Rinse with warm water after use – Avoid detergents to preserve the natural patina.

Do not soak in tea overnight – This prevents excessive staining.

Avoid extreme temperature changes – Sudden hot or cold shifts can cause further cracking