Tempera Grassa｜油性蛋彩：蛋彩與油畫之間還有一種真正以蛋、水、乾性油形成乳化媒材的中間態
WHAT 這是什麼
Tempera grassa is an emulsion painting medium combining whole egg, a drying oil, and water. The egg acts as an emulsifier, allowing oil and water phases to form a workable medium that occupies a material position between lean egg tempera and oil-rich painting systems.
WHY HERE 為什麼屬於底域的世界
它讓「蛋彩 vs 油畫」不再是兩個封閉盒子：蛋本身就能替彼此不相溶的水與油搭橋，形成真正的中間材料。
BLIND SPOT 補了哪一塊少看的視角
歷史 tempera grassa 配方並不統一；僅憑表面外觀很難確定 binder，常需材料分析，不宜把所有半啞光舊畫都歸入此類。
