Final answer:
Johannes Vermeer used oil paint to create the reflected light and the soft texture of the eyes in his painting ‘Girl with a Red Hat.’ His masterful use of oil paint and his ability to capture light and shadow are evident in his works.
Step-by-step explanation:
In Johannes Vermeer's Girl with a Red Hat, the medium used to indicate the reflected light and the sticky softness of the eyes was oil paint. Vermeer is known for his expert use of oil paint to create light and shadow to give his paintings a lifelike quality and depth. This technique is evident in many of his works, including the Girl with a Pearl Earring and The Milkmaid, where he used a limited palette of colors and achieved motion and realism through careful placement of light and texture.
Vermeer's paintings exhibit a mastery over light and its reflections, often enhancing the sense of three-dimensionality and texture. The oil paint allowed for slow drying, enabling the artist to blend colors to achieve subtle gradations and create layers that reflect light, making the surface shine. Ground-up glass was sometimes added to pigments by Venetian painters for better light reflection, a method that may have influenced Vermeer's technique.