While in Spain, Hsieh was successful at luster glazing, but mostly he used copper oxide, which produces brassy hues. Six years ago, at the request of a customer, he began experimenting with the silvery-yellow tones of silver oxide.
在西班牙時期，謝嘉亨已成功燒出閃光釉，但釉彩以加入氧化銅的黃銅色澤為主；6 年前在客戶要求下，他開始研發呈現溫馨黃銀色調的氧化銀。