oh those are beautiful!Croad are supposed to.
"The 'plum' egg colouring is a bloom over the top of a pinkish brown shell. The darker brown the shell the darker plum the colour will appear. Some eggs have a white bloom but a good example will have a pale purple colour bloom over a darker shell. This is why the Poultry Club Standards list the egg colour as brown. " quoted from http://clarescroads.webs.com/eggcolour.htm
and heres a pic off some amazing ones...
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