Values in António de Carvalho da Silva Porto rest in the mid-range - neither dramatically lit nor steeped in shadow. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. #D6C098 delivers the chromatic peak at only 6.9% - a small shot of colour with outsized visual impact. The value range of 51 units sits in the comfortable middle: enough depth, enough light, neither extreme. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. Palette 4 sits within the larger chromatic argument that António de Carvalho da Silva Porto's complete body of work advances.