This vessel achieves it colouration from a fast firing in a home made gas  kiln. Fired to 800°c in around 40 minutes in a saggar, organic materials oxides and acids such as sawdust seaweed and salt give this vessel shades of greenblack and red.
Please note this vase is made from raku clay that will not hold water and should be handled with care as to not scratch the surface .

Size approximately  22cm high

Saggar fired vase