Quick story:
Fiancee used to froze her extra milk for our kid for later use. Lactating can end with short notice bla bla bla... She used these icecube "holders" to froze it since they where then easy to defreeze.
Well I had a party. Babyshower ,for guys only, don't know what you guys call it? I remember hearing somebody saying something about funny colored icecubes but didn't really take notice.
The next morning a friend told me that some other guy had complained not just about the color but also that they tasted funny in whiskey
Did taste it myself. Quite unlike your "normal" milk. High lactose content broke a havok in my belly tough.