Ciao a tutti,

qualche tempo fa, il buon Valerio mi ha fatto omaggio di una confezione in polvere di AGFA REFINAL.

In rete ho trovato bene poche informazioni: ho letto che è un "cugino" del D-76. Mentre in altri lidi ho appreso che è imparentato col microdol (credo).

insomma, ho una gran confusione in mente.

Qualcuno lo ha mai usato o lo conosce?

Grazie,

Enrico.

Vado a memoria, perdonami eventuali inesattezze.

Il Refinal è uno sviluppo finegranulante con una formula tamponata al borato di sodio, idrochinone e qualcosa di simile al Phenidone (che è un nome ed un brevetto Ilford). Era infatti considerato il microphen dell'Agfa, e come tale incrementa la sensibilità a parità di contrasto.

Ampia sitografia in inglese, tra cui questo:

5.2 Refinal
Allround very high yield balancing developer in powder form
which, as drum, small tank or tray developer and – with proper
r epl eni shment – a s de ep t ank de v e lope r , wi l l ensur e a
consistently high speed yield and uniform gradation over
particularly long periods. Refinal produces fine grain and sharp
contours.
Mixing instructions
Stir Part A into at least 75 % of the total quantity of water
needed at 40 °C until completely dissolved. Then stir in Part B.
After it has dissolved, top up with water to the final volume.
It is not advisable to weigh part-quantities for smaller volumes,
since the chemicals may have been separated by vibration during
transport.
Specific gravities of freshly mixed solutions (at 20 °C):
1.064 – 1.070 = developer/ 1.072 – 1.078 = replenisher
C-SW16 9Yield
With replenished processes – approx. 14 ml replenisher per
135-36 film: 71 films 135-36 with 1 litre replenisher.
Yield without replenishment:
• 10 – 12 films 135-36 or rollfilms 120 per litre
• 50 – 60 sheet films 9 × 12 cm per litre (= 0.5 – 0.65 m²)
Replenishment: see page 11.
Life
The developer can be kept dry in the original pack at room
temperature for at least two years. Unused fresh solution will
keep in brimful tightly capped bottles for about six months.
Used developer should be stored separately from fresh. The life
of used developer is reduced to about three months. The life of
replenished developer in tanks with floating lids is at least
twelve months.
Developing times (at 20 °C)
Small tank, tray
Contrast APX 100 APX 400
? 0.65 6 min 5 min
0
24
22
20
18
2 4 6 8 10 12 14 16 18
APX 400 APX 100
Refinal
Developer temperature (°C)
Developing times at different temperatures (small tank, ? = 0.65)
Developing time (min)
Rotary process (drum)
Contrast APX 100 APX 400
? 0.55 3 min 3 min
? 0.65 5 min 5 min
? 0.75 8 min 8 min
Agitation
Tray: Continuous agitation.
Small/big tank: Continuous for the first minute, then every
30 seconds
Drum: Continuous, changing the direction of rotation.
Process in tanks
The optimum developing time is governed by the printing process
concerned, the processing temperature and the gradation required.
The times can be individually determined, depending on the film
type and the above criteria. The following developing times are
given here as guides.
Temperature Time
18 C° 7 – 9 min
20 C° 5 – 7 min
22 C° 4 – 5 min
24 C° 3 – 4 min
Film speed (exposure index = ? 0.65)
Film type Time * Speed
Agfapan APX 100 6 min ISO 160/23°
Agfapan APX 400 5 min ISO 500/28°
Fuji Neopan 400 Prof. 3.5 min ISO 320/26°
Fuji Neopan 1600 Prof. 3.5 min ISO 400/27°
Ilford PAN-F Plus 4 min ISO 50/18°
Ilford FP 4 Plus 7 min ISO 160/23°
Ilford HP 5 Plus 5 min ISO 640/29°
Ilford Delta 100 5 min ISO 125/22°
Ilford Delta 400 5 min ISO 400/27°
Ilford Delta 3200 6 min ISO 1250/32°
Ilford SFX 200 4 min ISO 125/22°
Kodak Plus-X 4 min ISO 125/22°
Kodak Tri-X 4 min ISO 400/27°
Kodak T-MAX 100 5 min ISO 80/20°
Kodak T-MAX 400 4 min ISO 400/27°
Kodak T-MAX p3200 6 min ISO 1600/33°
Kodak Recording 2475 5 min ISO 800/30°
* Small tank or tray processing at 20 °C.

fonte: http://mauglee.kitox.com/files/agfa_bw_film_chemicals_en.pdf