The “Southern Kiln Notes” states: “One type of Lu Jun glaze is fired in a furnace, and those with red dots amidst the flowing colors are considered the best, followed by those with green dots.” Judging from extant treasures, the Lu Jun glazes of the Yongzheng period feature a mix of red and blue, with large flows in the glaze surface and a predominance of red. The Lu Jun glazes of the Qianlong period have smaller flows, with more blue dots.

Lu Jun glaze was produced in Jingdezhen during the Yongzheng and Qianlong reigns of the Qing dynasty as an imitation of Jun glaze.

In the Ming and Qing dynasties, a glazed pottery also emerged locally in Yixing. Due to some similarities between these products and the Song Dynasty Jun kiln wares, they were called Yixing Jun ware. In the late Ming dynasty, Ouziming was the most successful producer of Yixing Jun ware, and his works became known as Ou kiln pieces. Yixing Jun ware had both white clay and purple clay bodies. Lime kiln sweat containing phosphorus was added to the glaze as a flux to give the glaze layer an opalescent quality. The main glaze colors were sky blue, light blue, gray-blue, and mung bean color, with occasional moon white and grape purple. During the Qianlong and Jiaqing reigns of the Qing dynasty, Ge Mingxiang and Ge Yuanxiang of Dingshan, Yixing continued to produce Yixing Jun ware. Their products mostly included fire basins, flower pots, water containers, and the like. They had rich glaze colors and unique Jun glazes, with a blue hue, representing significant progress over the Ou kiln pieces. These works came to be known as “Ge kiln” pieces.

At this time, influenced by Yixing Jun ware, purple clay Teapots were glazed after their initial firing and then re-fired, creating what has come to be known as Yixing Lu Jun glaze. Compared to Jingdezhen Lu Jun glaze, Yixing Lu Jun glaze had its own characteristics. Jingdezhen Lu Jun glaze came in plain and variegated types; the plain type lacked golden-red spots, while the variegated type featured such spots. As recorded in the “Southern Kiln Notes”: “One type of Lu Jun glaze is fired in a furnace, and those with red dots amidst the flowing colors are considered the best, followed by those with green dots.” Judging from extant treasures, the Lu Jun glazes of the Yongzheng period feature a mix of red and blue, with large flows in the glaze surface and a predominance of red. The Lu Jun glazes of the Qianlong period have smaller flows, with more blue dots.

According to the Qing dynasty writer Ruan Kuisheng in his book “Tea-Time Chatter,” “Recently, Yixing sand teapots have been coated with glaze from Raozhou (the old name for Jingdezhen), which makes them shine but loses their original appearance.” This passage refers to Lu Jun glaze. Ruan Kuisheng, whose courtesy name was Anpu and pen name Baocheng, and who also went by the names Tangshan and Wushan, was from Shanyang, Jiangsu (present-day Huai'an). He passed the imperial examination in the 17th year of the Qianlong reign and served as Deputy Minister of Criminal Affairs. He authored “The Seven Record Collections.”

Based on Ruan Kuisheng's life and the date of his book, it can be deduced that the decoration of purple clay teapots with Yixing Lu Jun glaze was documented during the Qianlong reign, though the actual practice may have started earlier.