Right. This is where I show my complete disknowledge.
I decided i'd test my hex codes in her demo.
When I added an event, and put a message with "\c[0xcb9913]this is a test" then started it, the game's text was all entirely invisible. So I deleted the event. I tested the game to see what I was missing and the text was STILL invisible. I had to refresh the game to get the text back.
So I figured "the old guy with the example will work! he's already GOT the code!" so I changed his one to cb9913 to test the first of my five custom colours. I start the demo... text is once again invisible, even after I change him back, and I have to refresh the game from a backup again.
What did I do wrong?