Riprendendo l'argomento dello sviluppo in tecnica STAND,
aggiungo solo come appunto la possibilita' di utilizzare anche
un rivelatore come il
Pyrocat HD che permette di utilizzare
la soluzione A (stock) e la soluzione B (stock) con diluizoni
del tipo 2A + 2B + 400 o 500 ml di acqua .
I tempi sono in genere di 45 / 60 minuti di sviluppo per le pellicole
di uso piu' comune.
Qui uno stralcio da un articolo dedicato al Pyrocat HD :
Stand Development — Stand development is a highly specialized type of development
that makes use of extremely dilute developers in conjunction with very long
development times. It has as its purpose the creation of extreme adjacency effects and
maximum apparent sharpness. It also gives maximum emulsion speed and provides great
compensating effect. When it works, the results can be extraordinary, even stunning.
Unfortunately this method of development is fraught with dangers and in practice it will
be found that some films, especially high-speed films, are poor candidates for this type
of development. And even when the procedure works well for a particular roll of film
there will often be one or more frames that are ruined because of an air-bubble, bromide
drag, or one of a number of other development artifacts that can plague this method of
development. For this reason it is essential to test your film thoroughly, and to always
make two or more back-up shots of important scenes when using stand development.
With stand development you should always pre-soak the film for about five minutes to
eliminate the formation of air-bubbles. Should an air-bubble form on the film during
stand development the negative will be ruined because the bubble will prevent any
exchange of developer at that spot, and the effect will be to spread irregular circular
patterns of up to 1/4” to 3/8 “in diameter around the bubble, ruining the frame or sheet of
film.
The working Pyrocat-HD solution should be mixed at approximately 2:2:400-500, i.e.
two parts A + two parts B + 400-500 parts of water for stand development. To begin
development discard the pre-soak water, pour in the developer, and agitate continuously
and vigorously for 60 seconds. Then, set the tank aside and leave it with no further
agitation for the remainder of the development period. Development times for most
films will be in the 45-60 minutes range