Raku is very interesting in the way its created !! Pottery is fired in the kiln and while still hot is removed and placed in a metal container that can be enclosed with a lid, inside the container may have newspaper, wood shavings ect, that will immediately combust when the hot pottery is placed inside, then the lid is put on and it stays till cool !! That is what creates the irridescence you see on the surface of your pot !! Would like to find something like that here,, but I ain`t looking to do that !! It can be pretty pricey stuff !! Great find !!