According to ancient records The color of Ru furnace has many different shades, Mainly blue, but also sky blue, pink blue, pea green, shrimp blue, sapphire blue, moon white and other colors . There is a proverb that says: "Clear and virgin clouds" are loved by everyone, there is also a saying "Noble blue, noble pink, extremely precious blue". To meet actual requirements for supply and land of “Ru Guan Oven” has a fragrant gray color due to different formulas, For example, the earthy color of Ru Guan Kiln porcelain