mixed in my studio Blue Spruce is what i believe to be a micro crystalline glaze. its finish is matte and the rutile, cobalt and copper create the mottled green of a Blue Spruce pine tree. it is rare that i use this glaze on its own. i typically use it over the gun metal black to get a liquid looking blue that seems to float off the surface. it also found its way on to my green/blue striped line of work it’s the last dip and darkest shade to the four color pattern.