How to make a blue blur base specular with coat car paint?

I met a special car paint, it is white color diffuse, but with some blue particles painted on the base, and with coating.
The visual effect is : High reflection with a blue diffuse specular around the hightlight. Please see the picture reference.

So it seems that specular color is blue, but I don’t know how to change the specular color as it is only scalar parameter.
Can anyone help me on this?
Thanks so much!!!