When red and blue are combined, a violet or purple hue is generated. Purple is a secondary hue that can only be created by combining these two fundamental hues.
Both red and blue are primary hues. This means that they cannot be created by combining colours. When two primary colours are combined, the resulting colour is known as a secondary colour, and its hue can vary based on the proportion of each primary colour. All secondary colours are positioned on the colour wheel between the primary colours from which they were created.