The very standard Mandarin is called Bai Jing, and the so-called nonstandard Mandarin is called Bai Yun.

Bai Yun and Bai Jing sometimes distinguish the identities of characters: for example, Jiang Gan, a civil servant, used Bai Yun. For example, when moving, use Bai Jing. Sometimes the same character will use rhyme white and Jing white on different occasions, such as the corner of Jin Hu in "Spring Grass Hit the Hall" and Bai Jing in "Hit the Hall and the Sedan with 20% Discount"; See the young lady, and see the old master of Yunbai.

Take your time.