Deep-sunk Tea Cup for Contemporary Tea Ware
当代茶器设计中的深下凹盏
标签：茶器, 深下凹, 器皿设计, 内旋纹, 手工肌理
深下凹茶盏（口径 70 mm、深 45 mm）的要诀是"先定底后定口沿"：用 φ8 mm 圆头锤自中心螺旋外推，每圈重叠加 30%，至第 5 圈转入侧壁并保留内旋纹作肌理；0.9 mm 紫铜经 4 次退火（650 ℃、暗红后空冷）延伸约 60%。口沿滚压收圈后内壁涂食品级清漆，外壁保留氧化暖棕色。
For a deep-sunk tea cup (70 mm mouth, 45 mm deep), work "base before rim": spiral outward from centre with a φ8 mm domed hammer at 30% overlap per ring, switch to the side wall at ring five and keep the inner spiral as texture. 0.9 mm copper stretches about 60% over four anneals (650 °C, air-cooled from dull red). Roll the rim closed, lacquer the inside food-safe and leave the outside its warm oxide brown. ---