Hi, I have a pickup truck load or two of the NW blue grey clay. It is left over from my project, and is great stuff. It is pretty pure, and I have low-fired it in my wood stove it to make trinkets. They come out tan colored. So, if anyone in Seattle needs a load or 10 gallons to make a cob oven...let me know! I may wind up with more garden space yet! Dulane