Development time

Ilford HP5 Plus in PMK Pyro

13:00 at 21°C, 1+2+100 dilution, box speed.

Start timer · 13:00

Time

13:00

Standard

Dilution

1+2+100

Temperature

21°C

Box speed

ISO 400

B&W

All 2 times

Dilution	EI	Time	Temp	Agitation	Timer
1+2+100	400	13:00	21°C / 70°F	Standard	Start timer
1+2+100	400	8:00	27°C / 81°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
18:03	16:11	14:27	13:00	11:33	10:24	9:23

Calculated from the 21°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+2+100	See the developer’s instructions	See the developer’s instructions

How they work together

PMK Pyro: Fine grain, very-high acutance, full film speed, compensating contrast. Extraordinary highlight separation with proportional staining.
Ilford HP5 Plus: A robust, all-purpose film. Slightly lower contrast than Tri-X with excellent shadow detail and pushability.
Notes on this pairing: Sheet gives EI 320-400. 70°F (21.1°C). Two inversions every 15 s.
80°F (26.7°C). Sheet gives EI 320-400. Two inversions every 15 s.

HP5 Plus in other developers

510-Pyro