Having just come back to developing my own films after
a lapse of over 20 years I'm rather confused as to what
developers/brews are available now and what their
individual characteristics are.
Some developers are intended for one-shot usage. If you
intend to develop film with that method then consider those
more suited to the method. Many developers can be used
one-shot although more so intended for reuse with
increased developing time and/or replenishment.
Two classic examples: Rodinal and D-76. Rodinal at working
strength contains very little chemistry; tossed after a use.
D-76 can be used one shot but at usual working strength
carries much chemistry down the drain.
Then there are the two bath developers. The solutions
are reused much. The chemistry load per roll of film is
very low. Many swear by the long life and consistent
results of two bath developers. Off the shelf Diafine
is the most famous example.
Compounding fractional batches at home from a
few chemicals is a good way to test method and
type. Photographer's Formulary is a good source
for chemistry and they do supply small as well
as large amounts. They've also off-the-shelf
in quite a variety.
Make method and type of developer your guide
lines and see what you come up with. Dan