Retzuah being black
A gutte Voch, I have never clearly understood the halacha regarding retzuah with small white cracks or marks. I know it's halacha moshe mesinai that they have to be 100% black and some opinions say there is a zero tolerance aspect and even one or two small white cracks are meakev. However there are also lenient opinions such as the Daas Kdoshim that as long as the majority is black it is OK bedieved. What is the halacha lemaisah on this?