Food dyes were the absolute devil in this country for so many years that it's quite the surprise now to discover they're all naturally sourced sensible dyes now.
It was so vehement they were absolute poison it still makes me queasy now to use decent natural food colourings!
What did you use to turn the blue eggs blue? (I know beets can work for the red ones.)
You can use red cabbage to turn eggs blue: Easter Eggs, but better.