Green Shoulders

[Black Krim]

Being the product of the modern grocery, green shoulders have a stigma that I want to erase.....that is if warrented.

To me the green is un sightly and being a relative to the potato, is it ok to eat? Small amounts of green potato peels cause GI upset. But also tomatos??

Reading the varieties at Tatiana's site gives me hope that the green is fine to eat.

Why do some varieties have the green and others dont.... beyond selection.

Thank you in advance.