It is week three and the home potters are back in Stoke-on-Trent for more tough tests of their ceramic skills, each hoping to be named top potter. They are playing with fire in their main make, when judges Kate Malone and Keith Brymer Jones ask them to make ten identical long-necked vases using the raku technique. This Japanese method of decorating and firing dates back to the 16th century and requires the potters to take their red-hot vases straight out of the kiln and plunge them into a bin full of combustible materials. For their spot test, the potters must produce the finest decoration on three jugs using slip - watered-down clay. It is an ancient method which first enabled potters to colour and pattern their work. And for the throw down, the potters have just 15 minutes at the wheel to produce exact copies of two ornate candlesticks thrown by master potter Keith.