Do chickens ever not eat the supplemental calcium?

[Soon2BChixMom]

People calcium tablets as found in the vitamin aisle. Or you can try to find powdered calcium at a feed store. I crush a tablet and sprinkle it over some grated raw carrot. Or I might just dip the tablet in peanut butter. Most chickens think peanut butter is a fine treat.

When you see little calcium pimples on the eggs, you can stop giving the supplement.

Sometimes the eggs do have those, but obviously not the soft egg layer. Not sure how to find out who it is. It is not the Brahma as her eggs are slightly smaller and lighter in color. I believe due to who lays early in the morning, I have it narrowed down to two of them.