The primary color produced by mixing blue and yellow is green. In color theory, blue and yellow are classified as primary colors in the subtractive color model, which is commonly used in art and design. When blended, they create a secondary color: green. This mixing process is foundational in various applications, such as painting, printing, and everyday color mixing. Different shades of green can be achieved by varying the proportions of blue and yellow, leading to a wide range of hues, from bright lime green to deep olive green.