Usually the naturally black hair has always some undertone. It could be brown, reddish... These undertones are seen in the sun, even with people who never used any products in their hair. (My hair has some reddish hue in the sun.)

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3 a / low porosity / medium texture and density

Two daughters:
3 c / low porosity / fine texture / medium density
4 a / low porosity / fine texture / high density