AMMO by MIG Pigments - Fine Pigment Powders for Modelling
Color: Rubble

From the Manufacturer:

A grey color used for achieving a dusty appearance in an urban environment. High quality Pigment, superfine and made from natural products for exclusive use in modeling.This color is specially designed to make effects in your models using the techniques that Mig Jimenez created for more than a decade. Use it alone or in combination with other AMMO products.