Posted for "Alain NOIREAUX" <alainoireaux@club-internet.fr>:

 Thanks for these explanations Scott,I understand why the inside of my tanks
is brown
 Alain NOIREAUX  L 320  F-PSDV

"""
  The safetypoxy II can (and will) turn a rich brown color - and is fine as
long as it appears clear (translucent) as opposed to muddy.  The benefit is
(and was) that voids stand out like a tan thumb when used with the glass (not
carbon) prevalent at that time. Some of the reason that the hardener turns
brown is interaction with the valve in the proportional pump and some is age.
"""