What changes appear in the colors of Frans Hals’s late paintings?

In the late paintings of Frans Hals, the artist’s palette lost much of its former luster as he diminished the intensity and vividness of his themes.1

While his earlier works were characterized by a "colourful blare," his later compositions moved toward a greater simplicity. Hals increasingly relied on a broad range of blacks and whites, which he found sufficient to convey his artistic vision during his final years. This shift in color palette accompanied a broader evolution in his style, where he took greater liberties with his painting technique, moving away from the vibrant, articulated masses of his youth toward an art that captured more elusive, nervous energy and subtle human character.1