Re: Milk looks oily!
I'd consider that a normal variant. Milk composition changes as a duct goes from full to empty. At the beginning, when the duct is very full, the milk is relatively high in water and lactose and relatively low in fat. As the duct gets emptier, the fat that clings to the side of the duct starts to get pulled out. When the duct is really, really empty, you might see some very fat-rich milk, which would look oily rather than watery.
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