Jean-François Portaels sits in the centre of the value range, lending the palette a sense of even, sustained light. Heat pervades this palette; warm chromatic identities outweigh cool ones at almost every weight. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The highest-chroma note - #A33C1D - appears at just 3.8%, deployed as a precision accent against the quieter ground. Spanning 53 units on the value axis, the palette achieves the balance between tonal flatness and fragmentation. This is the light Jean-François Portaels preferred, made measurable.