Nope. Depends on the dyes used in their manufacture. Films
like D3200 use a different sensitizing and AH dyes and usually look
gray (like fog) when underfixed.

Regards,

  John S. Douglas, Photographer -  http://www.darkroompro.com
             Please remove the "_" when replying via email

   The pink color in T-Max is from residual sensitizing
dyes which are bound to the gelatin. Kodak says its an
indication of underfixing but, since thiosulfate and fixer
reaction products can also be bound to the gelatin, its
possible the fixing is complete. Sufite wash aid tends to
free bound ions by two means: it adjusts the pH of the
gelatin to above its isoelectric point where the charges in
the gelatin tend to repel the bound ions rather than attract
them; and it acts as an ion exchanger, displacing them from
the gelatin. Since the same forces which bind the
thiosulfate and reaction products also bind the dye the dye
will be removed.
   The isoelectric point of most photographic gelatin is
slightly on the acid side of neutral. Treating the emulsion
in an alkaline or neutral bath will bring the ph to above
(more alkaline) the isoelectric point.
   When an alkaline or neutral fixer is used the emulsion
will leave the bath in this condition (pH above the
isoelectric point) which is one reason it will wash faster
than it will after an acid fixer. However, it is not simply
the acidity of an acid fixer which tends to retard washing.
Most (but not all) acid fixers contain a hardener composed
of Potassium Aluminum Sulfate, AKA white alum or just alum.
The alum, over a range of pH, is an efficient binder of ions
to the emulsion. It is primarily the alum in hardening
fixing baths which retards washing. However, the alum loses
its abiility to bind thiosulfate and silver complexes to the
gelatin when its pH becomes neutral or alkaline. At neutral
pH the hardening action is preserved, at alkaline pH the
hardening is lost. The hardness of the gelatin has no effect
on wash rate.
  Fixing baths made with Potassium chromium sulfate (Chrome
alum) must be much more acid than those using white alum but
the wash rate is no worse than an acid non-hardening bath.
The chrome alum does not act as a binding agent as white
alum does. Unfortunately, chrome alum fixing baths have
short lives and are unsuitable for general use.
  Gelatin is what is called "amphoretic", that is it does
not have a pH of its own, rather it takes on the pH of the
last bath its been in. However, there are some pH specific
properties, the most important one being the isoelectric
point. On the acid side of this point the electrical charges
in the emulsion are one way, on the alkaline side they are
the other way. Also, the swelling of the emulsion is least
when its pH is brouht near its isoelectric point. Low
swelling also increases wash rate because it minimises the
path ions must follow in diffusing out of the emulsion.
   There is some evidence that Ammonium thiosulfate fixer
washes out faster than sodium thiosulfate fixer but this
rate is also dependant on the factors discussed above.
   So, whatever kind of fixer you use a neutral sulfite
bath will increase wash rate and is good practice.
   Ammonium thiosulfate fixers ("rapid fixers") tend to be
less sensitive to accumulated silver and other substances
(bromide or iodide) from the emulsion so have greater
capicity for completing the fixing process. They are
considerably more tollerant of accumulated iodide so they
are very suitble for use with fast films.
   It should be understood that the conversion of the
unused silver halide from a non-soluble form to a soluble
form is not a simple reaction. Rather it takes place in
stages although they are continuous. Since it takes a lot of
thiosulfate to make the conversion there must be a lot of
free thiosufate ions in the fixer. As more silver is
dissolved more of the thiosulfate ions become unavailable.
It is the concentration of dissolved silver which is the
limiting factor in the ability of a fixing bath to fully
convert the unused halide to a form which will wash out.
Partly coverted halide is not fully soluble or it may be
bound to the image silver or the gelatin. Ammonium fixer
will continue complete fixing at silver levels at which
sodium fixers no longer fully fix. The use of two successive
fixing baths helps insure that the fixing conversion process
is completed so that the unused halide is fully washed out.
The use of a buffered sulfite wash aid will help to remove
some incompletely converted silver complexes by unbinding
them from the image silver and gelatin.