Thanks for the input! That is actually better news… since I am hoping that all the EEs will lay blue/green eggs. I also found my first blue egg in the favorite nesting box this morning, so I do have something to be excited about. I have free choice oyster shell out and they are on quality layer feed. It really seems like a trend with the first egg. Rubber egg one day, no extra eggs the second day, and on the third day I have another one laying normal shelled pullet size eggs. While it is not nearly as cold down here in VA, it is colder than the norm. Lots of chilly trips to the coop to collect eggs!don't get too excited yet,, that is only the membrane, not the shell.. and I don't think yellow is a color you will be getting from the EE ..
If you continue getting rubber eggs, supplement some oyster shells , free choice, besides their layer rations..
......jiminwiscwhereitisbelowzeroagain/yet...................