Development time

Kodak T-Max 100 in Diafine

6:00 at 20°C, stock dilution, EI 160 (+⅔ stop).

Start timer · 6:00

Time

6:00

Minimal

Dilution

Stock

Temperature

20°C

Box speed

ISO 100

B&W

All 3 times

Dilution	EI	Time	Temp	Agitation	Timer
Stock	160+⅔ stop	6:00	20°C / 68°F	Minimal	Start timer
Stock	200+1 stop	6:00	20°C / 68°F	Minimal	Start timer
Stock	80−⅓ stop	8:30	22°C / 72°F	Minimal	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
7:30	6:43	6:00	5:24	4:48	4:19	3:54

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

Diafine: Fine grain, high acutance, normal contrast. Good shadow detail with effective speed increase.
Kodak T-Max 100: Professional tabular grain film with very fine grain and notable sharpness. Well-suited for detailed work and large enlargements.
Notes on this pairing: 3 min Bath A + 3 min Bath B. 35mm and sheet film.
3 min Bath A + 3 min Bath B. Roll film.
4.5 min A + 4 min B, 35mm and roll film.

T-Max 100 in other developers

510-Pyro