🚀 go-pugleaf

    Talk about color shifts is probably closer than you think.  For
many years, detergent companies have been using optical brighteners
to make clothes look cleaner.  These are products which absorb UV
and fluoresce slightly in the visible range (normally blue).  In 
recent years, however, people have associated the "whiter-than-white"
of the optical brighteners with harsh chemicals which are therefore
non-ecologically sound (patently untrue -- optical brighteners are 
biodegradable, but what company is going to admit they make the 
clothes white by artifical means?) and so some detergents have switched
to green or red optical brighteners.  This may be why the lint in the
dryer is generally blue, and why some find red lint.  Although the
real reason is probably that most people have blue or black clothes, which
in general are more obvious than other colors.

Alex Richter