I do also cut the tips of the tasil hair square, when my mate has his albinos out as well, but
need some thing that stands out more from a distance, so I'm able to tell quickly which
ferret is behind a bolter, just to get an idea of who is working better.
I might try food colouring
Have noticed that they do a good job of cleaning each other, so nothing seems to stay on for more than a day or 2.