Development time

CatLABS CatLABS X Film 320 (35mm) in XTOL

11:00 at 20°C, stock dilution, box speed.

Start timer · 11:00

Time

11:00

Standard

Dilution

Stock

Temperature

20°C

Box speed

ISO 320

B&W

Development time

Dilution	EI	Time	Temp	Agitation	Timer
Stock	320	11:00	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
13:45	12:19	11:00	9:54	8:48	7:55	7:09

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

XTOL: Fine grain, high acutance, full film speed, normal contrast. Excellent shadow detail with wide latitude.
CatLABS CatLABS X Film 320 (35mm): Confirmed Kodak Double-X 5222 motion picture stock. Cinematic high contrast look. Note: 120/sheet versions are a different emulsion.

CatLABS X Film 320 (35mm) in other developers

D-76