Standard says blue. Lavs are variable because they are early in their development and some brown egg layers were used in some lines to improve them and those genes have to be weeded out. I just send people pics of my eggs and let them make the call on whether the color is acceptable to them or not. Egg color is high on my "to-do" list and I have blacks in my pens for that specific purpose and will be adding more this year. My two cents.