When in doubt ask someone else- the following is from my husband, biochemist.

"Someone recently asked why milk is white.  Jack Newman  pointed out that
kangaroo milk is pink.
        Milk is most likely white because its particles are finely divided and
in between in size from a solution (like salt water) and a suspension
(like muddy water).  Particles of this size which are called colloids
tend to scatter all light that strikes them.  The small particles of
water in clouds also scatter light and are white for the same reason.
        As to why kangaroo milk is pink, I am only speculating here.
Most mammals are born at full term and have more iron than they need
because of excess fetal hemoglobin.  Kangaroos start nursing so early in
their development that they obviously need additional iron as they grow.
I would not be surprised if the milk is pink because of a high iron
content.  Biological iron componds range in color from pink to red to
brown. A quick search of two standard sources (Handbook of Biochemistry,
and Biological Data Book) did not have the composition of kangaroo milk,
so I could not confirm this speculation.  This speculation is not proof
that could hold up in court, especially in a kangaroo court."

Sarah Friend Barnett   LLLL, IBCLC
Bronx (New York City), NY  -  [log in to unmask]
" You are not obliged to finish the task,
 neither are you free to neglect it."       R. Tarfon