egg colors

[gad62]

i bought what i was told was ideal 236 but the local i bought from hatched these out of his birds for the most part i have gotten blue eggs on friday i got 1 white and 1 blue saturday i got 3 blue and 1 brown this is from only 4 hens did 1 change egg color from white to brown? today i got 2 blue they just started to lay in the last 2 weeks.