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Development time

Kodak Portra 400 in Flic Film C-41 Eco Kit

3:30 at 39°C (102°F), stock dilution, box speed.

Start timer · 3:30
Time
3:30
Standard
Dilution
Stock
Temperature
39°C
102°F
Box speed
ISO 400
C-41

All 2 times

DilutionEITimeTempAgitationEvidenceTimer
Stock4003:3039°C / 102°FStandardManufacturerChecked Oct 2026Start timer
Stock4003:0038°C / 100°FContinuousManufacturerChecked Oct 2026Start timer

EI is the speed the film was rated at when shooting. Evidence says where each time comes from: the manufacturer’s own data, a named test, a compilation or several agreeing reports (community consensus), or one person’s report. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet. Where sources give different times, every one is listed and marked “sources differ”.

Other temperatures

Colour developers run at 39°C (102°F) with a tight tolerance of around ±0.3°C, so there’s no reliable temperature chart. If you can’t hold the temperature, follow your kit’s instructions for its lower-temperature times.

Mixing

Dilution300 ml (10.1 fl oz) (one 35mm roll)500 ml (16.9 fl oz) (one 120 roll)
StockUse as mixed, undilutedUse as mixed, undiluted

How they work together

Kodak Portra 400
Kodak calls it the world's finest-grain high-speed colour negative film, at true ISO 400 with natural skin tones and wide-ranging lighting performance (Kodak E-4050, Jan 2025). Made with Kodak's T-Grain emulsions; sold in 135, 120 and sheets.
Notes on this pairing
  • Kit time; applies to any C-41 film. Inversion tank at 39 °C: continuous for 10 s, then four inversions every 30 s. Jobo or machine at 38 °C: 3:00.
  • Kit time; applies to any C-41 film. Jobo or machine processing at 38 °C.

Portra 400 in other developers

Other films in Flic Film C-41 Eco Kit