Though Professor Llacer had provided Hsieh with over 200 different glaze recipes to experiment with, Hsieh's attempts were unsuccessful even after a year and a half. At this time an artist friend learned from his reading that the Arabs added large quantities of tin to their kiln fires. Hsieh tried and to his surprise was successful.
儘管 Joan Llacer 教授提供了二百多種釉藥配方讓謝嘉亨試釉，但歷時一年半仍無法成功，這時有位藝術家朋友從文獻資料中得知，當初阿拉伯人在燒釉時加入相當多的錫，謝嘉亨姑且一試，竟然成功了。