C13 He Couldn't be a Fool Could He?

The boss nodded and turned to Wang Cheng with a smile on his face.

The boss was about to say something when he heard Wang Cheng's voice. "The method to pick up the gelatin is very simple. The first thing he saw was its color. The authentic gelatin was flat, with a neat corner, and its surface was either dark brown or dark black. It had a luster, and its edges were translucent