Mixing colors

Hello,
I’m trying to mix two different material colors to get another color using transparency. The setup is basically like this (I’m attaching the blend file below):


I’ve been playing with it for a while, but I couldn’t get the result I wanted (e.g.: not bright enough). I’d like to know if this is doable, and if it is, how? Thanks in advance!

mixing colors.blend (425 KB)