When you mix red and brown together, the resulting color is a deeper, richer shade of red. Brown is essentially a darker version of orange, which is a combination of red and yellow. Therefore, adding brown to red intensifies the red, making it darker and more muted. This new color can be described as a maroon or burgundy shade, depending on the proportions of red and brown used. These colors are often associated with warmth, richness, and sophistication.