Some ducks have a grungy bloom. I had a buff with the WORST looking eggs...LOL
there were several huge platters of diveled (Sp) eggs, more than the coolers could hold so they were left on the table with just net to keep the bugs out. Everybody had their fill, by evening there were several ill...
To put down a egg we would dip it in a solution called 'water glass' (sodium silicate solution) when the coating was dry it was like a thin coating of glass over the outside of the egg. then we would store them in our coldest root cellar, (our ice box actually had ice added to it for cooling)...