Development time

Ilford Ortho Plus in Ilfosol 3

5:00 at 20°C, 1+9 dilution, box speed.

Start timer · 5:00

Time

5:00

Standard

Dilution

1+9

Temperature

20°C

Box speed

ISO 80

B&W

All 2 times

Dilution	EI	Time	Temp	Agitation	Timer
1+9	80	5:00	20°C / 68°F	Standard	Start timer
1+14	80	7:00	20°C / 68°F	Standard	Start timer

EI is the speed the film was rated at when shooting. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet.

Other temperatures

18°C	19°C	20°C	21°C	22°C	23°C	24°C
6:15	5:36	5:00	4:30	4:00	3:36	3:15

Calculated from the 20°C time using Ilford’s temperature compensation factors, not taken from a datasheet. Most B&W developers behave well between 18°C and 24°C.

Mixing

Dilution	300 ml (one 35mm roll)	500 ml (one 120 roll)
1+9	30 ml developer + 270 ml water	50 ml developer + 450 ml water
1+14	20 ml developer + 280 ml water	33 ml developer + 467 ml water

How they work together

Ilfosol 3: High acutance, full film speed, medium-high contrast. Good general purpose results.
Ilford Ortho Plus: Orthochromatic film sensitive to blue and green only. Can be handled under red safelight. Reds and oranges render dark.
Notes on this pairing: Pictorial contrast (Gbar 0.62).

Ortho Plus in other developers

D-76