Here were the results:
According to the natural egg dying lore out there, baking soda makes the dye look more teal than blue and that has always been our experience. You can see it most strongly in the second row from the bottom egg on the right. Except this time. You can judge the results of this highly unscientific experiment yourself.
This one is deceptive. It was dyed in cabbage dye and 1 Tbl. of vinegar. The vinegar is supposed to soften the shell just slightly and help it accept the dye... kind of like sanding before you paint. Well, it turned out this really lovely blue color but as you can see...
... that was only a surface film. It rubbed off as soon as we started handling the eggs.
When all was said and done, it was about the same as the rest.