The only thing I can find in her post is the brand Americolor blue. They have three different blues to choose from. Sky blue, Royal blue and Navy blue. What shade do you think she used to achieve this cake? http://artisancakecompany.com/2013/05/tardis-cake-tutorial/
Looks like a combination of royal and navy. Not sure the royal would be dark enough on it's own. And navy is too dark. That is just a guess, though. Good luck!
I will agree with cutiger. Royal with navy to give it the darkness.
In the tutorial the lady said she used 1 tablespoon blue and 1 teaspoon black. I wasn't sure if the blue she used was navy or royal. I have a large bottle of Americolor navy blue how long does it last I can't find a date on the bottle. Thank you for your help.
You were correct it's royal blue and black thank you.