Case: Enamel Brooch
案例：珐琅胸针
标签：案例, 胸针, 珐琅, 实践
制作一枚铜胎透光珐琅胸针：①切铜片、打磨、酸洗 ②烧一层透明底釉（出光）③筛涂蓝透明釉，800℃ 烧 2 分钟至镜面 ④冷却后银丝掐边、点白不透光釉烧固 ⑤焊别针、整体抛光。成品蓝透莹润。要点：底釉必须无气泡，否则表层会"顶泡"开裂。
A copper transparent-enamel brooch: ①cut, grind, pickle the disc ②fire a clear base coat to gloss ③sift blue transparent, fire 800℃ 2 min to mirror ④cool, add silver-wire edge and white opaque dots, fire ⑤solder pin, polish. Result: deep clear blue. Key: the base must be bubble-free or the top "bubbles up" and cracks. ---