noun
polishing process; glazing process
A finishing process that imparts a glossy, lustrous surface to materials such as ceramics, metal, or wood.
この陶器は艶出し加工によって美しい光沢が出ている。
This pottery has a beautiful luster from the glazing process.
艶出し加工を施した金属部品は高級感がある。
Metal parts that have undergone a polishing process have a luxurious feel.
Compound of 艶出し (tsuyadashi, 'bringing out luster') + 加工 (kakō, 'processing'). The exact historical derivation is uncertain, but the term is transparently formed from its components.