Flakes to Mix Shader (Mix Weight)
You can also connect the mask (alpha channel) of the Flakes shader to a Mix shader to drive different colors for the flakes. For example, you could make the flakes metallic and the other parts glass by mixing them together using a Mix shader.
Mix_shader connected to alpha mask of Flakes flakes shader
You can use the Mix shader to mix multiple Flakes shaders together with different Density and Normal Randomize values. In the car paint example below, a second Flakes shader has been used to create brighter flakes that are visible around the highlight.