Which type of jadeite is known for being bleached and impregnated?

Type B jadeite is characterized by a process in which the stone has been bleached to remove impurities and then impregnated with resins or polymers to enhance its appearance. This treatment allows for improved clarity and color, making the stone more visually appealing and valuable. Type B jadeite retains some of its natural properties but is significantly altered through these enhancements, distinguishing it from other types of jadeite.

Type A jadeite refers to untreated jadeite, which has not undergone bleaching or chemical treatments, thus retaining its natural characteristics and value. Type C jadeite is one that has been dyed, making it different from Type B as it focuses on altering the color without the initial bleaching. "Old mine" jade does not refer to a type, but rather to a source of jade that was mined from older deposits, often implying higher quality but without specifying treatments.