[KensRedZed]

Colour mixing is an art. My dad was a master printer before he retired and grew up just to play golf. 

Besides black and white. There are three base colours from which most shades of anything are made. Red, blue, and yellow.

You'll need to add a lot of orange to make a dent in the red colour. Even then, it will not be very bright. If you want to make the red go towards bright orange/red. One drop of yellow does crazy things to a bottle of red.

Create a small test cup and see how quickly yellow changes red, into bright orange. Go very easy on the yellow. Little by little. You'll eventually find the shade you want.

Test twice. Paint once. Not the other way around.