Thus, before getting down to work on the final version of each piece, he made numerous trials, using different proportions of iron oxide, trying different temperatures, sometimes buffing the piece to make it glossy and other times not, to get as close as possible to the correct overall effect.
為此，他在真正製作前，要先做許多試片，用不同比例的氧化鐵、嶺口土，在不同溫度下試燒，有的磨光，有的不磨，以試出最接近的整體感。