Development time

Ilford SFX 200 in Perceptol

14:30 at 20°C, stock dilution, box speed.

Start timer · 14:30

Time

14:30

Standard

Dilution

Stock

Temperature

20°C

Box speed

ISO 200

B&W

Development time

Dilution	EI	Time	Temp	Agitation	Timer
Stock	200	14:30	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
18:08	16:14	14:30	13:03	11:36	10:26	9:26

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

How they work together

Perceptol: Moderate acutance, normal contrast. Extremely fine grain, optimised for enlargement.
Ilford SFX 200: Extended red sensitivity up to 740nm. Creates infrared-style effects with 720nm filter. Not true IR film but produces similar aesthetic.

SFX 200 in other developers

D-76