Possible explanation for this (hypothesis on my part)
If she has rusty milk on one side, suggesting "rusty pipes" and this milk is
tinged w/ blood, the other side w/ greenish black milk could be this color
from the breakdown of hemoglobin.
When blood breaks down, the hemoglobin molecule (a fragile one) decomposes and
the color becomes greenish black.
Just an idea.....
Marge Collier, MA, MT(ASCP), IBCLC