Langyao Hong

Quick answer：

Langyao Hong refers to a type of Chinese porcelain with a distinctive red glaze, known for its vibrant and uniform color. It was produced during the late Ming and early Qing dynasties. The technique of achieving this red color was highly valued and guarded as a state secret, and it was only after the fall of the Qing dynasty that the secret was revealed and Langyao Hong porcelain was widely produced.