What colour does orange and red make?
If you mix 50% orange (255, 127, 0) and 50% red (255, 0, 0) you will get redish orange color (255, 64, 0). It can be called vermilion or orange-red.
Tertiary colours are the six colours on a colour wheel between a primary colour and a secondary colour. They are: Yellow-orange, red-orange, red-purple, blue-purple, blue-green, and yellow green. To make any tertiary colour add one part of a secondary colour (green, purple or orange) and one part of one of the two primary colours that make it. For example, to make red-orange add one part red to one part orange.