The reading for the 真 is the vocab kun'yomi reading. Think of what is pitch black. It's your poor Ma (ま). She is so dark that she sucks in light, like a black hole... wait, she is a black hole, it explains why your Ma is pitch black.
Koichi loves pitch black garlic and he often eats it so much that his tongue bleeds.
Viet got such a deep tan on the beach in Hawaii that he looked like burnt toast.
OMG, I just came across the cutest pitch black dress.