Because turquoise has strong water absorption, there is oil penetration. According to the chemical network official website query.

1, strong water absorption. Turquoise has many pores and strong water absorption capacity. When it comes to milk, turquoise will absorb a lot of water in milk, which will cause the properties of minerals contained in turquoise to change and turn red.

2. Oil penetration. Turquoise has many pores. Milk contains fat, which will produce grease. Oil will seep into pores from the surface of turquoise. After the pores are blocked, turquoise will turn red.