We've dyed some eggs with organic food colorings ... only could we get red and green colors from the store, we tried to mix colors ourselves.
What happened was really amazing.
The same portion of red and green came together to produce a dark green dye, instead of brown or dark grey... The exterior of eggs became purple, not the expected dark green ... But the interior of shells (we also put some broken egg shells into it) turned into a beautiful emerald green! It's magical !!
We are going to use some natural ingredients for dyeing eggs in the Holidays.