Development time

Ilford HP5 Plus in ID-11

7:30 at 20°C, stock dilution, box speed.

Start timer · 7:30

Time

7:30

Standard

Dilution

Stock

Temperature

20°C

Box speed

ISO 400

B&W

All 9 times

Dilution	EI	Time	Temp	Agitation	Timer
Stock	400	7:30	20°C / 68°F	Standard	Start timer
1+1	400	13:00	20°C / 68°F	Standard	Start timer
1+3	400	20:00Not yet verified	20°C / 68°F	Standard	Start timer
Stock	800+1 stop	9:00	20°C / 68°F	Standard	Start timer
Stock	1600+2 stops	12:00	20°C / 68°F	Standard	Start timer
Stock	3200+3 stops	21:00	20°C / 68°F	Standard	Start timer
1+1	800+1 stop	15:00	20°C / 68°F	Standard	Start timer
1+1	1600+2 stops	20:00	20°C / 68°F	Standard	Start timer
Stock	200−1 stop	5:30	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
9:23	8:24	7:30	6:45	6:00	5:24	4:53

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)
Stock	Use as mixed, undiluted	Use as mixed, undiluted
1+1	150 ml developer + 150 ml water	250 ml developer + 250 ml water
1+3	75 ml developer + 225 ml water	125 ml developer + 375 ml water

How they work together

ID-11: Fine grain, moderate acutance, full film speed, normal contrast. Excellent balance of fine grain, sharpness, and tonal rendition.
Ilford HP5 Plus: A robust, all-purpose film. Slightly lower contrast than Tri-X with excellent shadow detail and pushability.
Notes on this pairing: Standard commercial processing time.
Increases sharpness and economy.
Maximum sharpness dilution. Use immediately after mixing.
Pushed +1 stop.
Pushed +2 stops.
Pushed +3 stops. Expect increased grain and contrast.
Pushed +1 stop. One-shot use.
Pushed +2 stops. One-shot use.
Pulled -1 stop. Reduced contrast.

HP5 Plus in other developers

Df96 Monobath