The evolution of Western representational art is fundamentally a history of the interaction between the artist’s vision and the material constraints of the medium. Among the various methodologies developed to bridge this gap, alla prima—literally meaning “at first attempt” in Italian—stands as a singular, transformative approach. Often referred to as “wet-on-wet,” “direct painting,” or the French “au premier coup,” this technique prioritises the completion of a painting in a single session while the paint remains wet. Unlike the traditional indirect method, which relies on a slow, multi-layered buildup of dried paint films, alla prima demands a synthesis of drawing, value, and colour into a unified, immediate performance. This article provides an exhaustive investigation into the historical, technical, and chemical dimensions of alla prima, analysing its rise from a niche tool of the Old Masters to the dominant practice of the modern era.