I buy eggs at the Farmers Market in NY and they are brown, I buy them at Safeway in Hawaii and they are white. Both taste the same to me!
Makes me wonder whether the uniformly bright white eggs at the supermarket -- most supermarkets in the US, but clearly not all -- are painted white for appearance's sake, to appeal to shoppers.
I do know that many US-grown oranges, including those produced right here in Florida, are spray painted or bath painted a healthy orange because many consumers reject oranges with green patches or differing shades of orange. Regardless of how uniformly good they are inside for eating or juicing.
Maybe Big Food has determined that consumers are as unlikely to eat an eggshell as to eat an orange rind, so those outsides are fair game for touching-up. I'd like to know that before making orange zest.