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If you are a beginner, SFGW is better. SFGW stands for soft fired greenware. It has been fired in a kiln to a cone 17 or 18 or 19. It will not break as quickly. There has been just enough heat to change the chemicals of the slip so the piece can be soaked in water to allow for wet cleaning. The dust from porcelain slip can cause a lung condition equal to black lung. There is a current trend to clean the pieces with brushes when they are leather-hard before they have dried.