A portrait of the scientist Sir Benjamin Thompson by Thomas Gainsborough, featuring the subject in a distinctive red coat.

This portrait depicts Sir Benjamin Thompson, a scientist and inventor who later became known as Count Rumford. Painted by Thomas Gainsborough around 1783, the work captures the subject in a formal military-style coat of striking red, contrasted against a dark, atmospheric background. Gainsborough employs his characteristic fluid brushwork, particularly visible in the treatment of the subject's powdered wig and the delicate lace cravat at his throat. The composition is framed within a painted oval, a common device in eighteenth-century portraiture to focus the viewer's attention on the sitter's features. Thompson is presented with a calm, composed expression, reflecting the intellectual confidence of a man whose career spanned military service, scientific research, and social reform. The play of light across the red fabric of his coat demonstrates Gainsborough's ability to render texture and colour with economy and grace. Gainsborough was one of the most successful portraitists of his era, often favouring a lighter, more painterly touch than his contemporaries. In this piece, the artist avoids rigid formality, opting instead for a sense of immediacy. The sitter's gaze is direct, engaging the viewer while maintaining a sense of aristocratic distance. The palette is restrained, allowing the warmth of the red coat to dominate the visual field without overwhelming the subtle flesh tones of the face. This print offers a clear reproduction of the original oil painting, preserving the nuances of Gainsborough's technique and the historical character of the sitter.