I just received this great C41 process developing kit (I got the 20 roll kit) from freestylephoto.biz and I’m diving headfirst in to processing my own color film for the first time.
The process seems only a bit little more complicated than black and white and the Rollei / Digibase chemicals have the advantage of being useable at an easy to maintain 25°C.
I put this page together as a cheatsheet for myself and most of the information here can be found in the Rollei / Compard Digibase C41 Processing Kit Instruction Guide [PDF]
Mixing the Chemicals
The 500 ml capacity that is most useful to me (I usually process either a single 120 or two 35mm rolls at a time in a Paterson tank) is not included in the Rollei instructions. 460 ml and 480 ml are there but 500 ml is nowhere to be found. I worked out the 500 ml solution by halving the 1000 ml concentrations listed in the instructions.
For 500 ml I used half of all the developer solution and bleach (which is a bright algae green in concentrate), ¾’s of the fixer and all of the stabilizer. The 50 ml of stabilizer included in the kit will only make a 500 ml working solution. You’d need 100 ml to make 1 liter of working solution. (The 500 ml working solution will work for 30 rolls, which is more than the developer should last anyway…)
Note that the water temperature needs to be at 49°C for proper mixing of the chemicals. I used a kettle to bring the water up to temperature and had my mixing graduates in a water bath at roughly 50°C to maintain temperature while mixing.
Developer


Working Solution

Water

Part A

Part B

Part C

Starter

Film Capacity*


300 ml

207 ml

30 ml

30 ml

30 ml

3 ml

4 6 rolls

500 ml

345 ml

50 ml

50 ml

50 ml

5 ml

7 – 11 rolls

1000 ml

690 ml

100 ml

100 ml

100 ml

10 ml

12 – 20 rolls

* 35mm, 36 exposure or 120 format rolls

Bleacher


Working Solution

Water

Bleach

Film Capacity*


300 ml

216 ml

84 ml

6 – 9 rolls

500 ml

360 ml

140 ml

10 – 19 rolls

1000 ml

720 ml

280 ml

20 – 28 rolls

* 35mm, 36 exposure or 120 format rolls

Fixer


Working Solution

Water

Fixer

Film Capacity*


300 ml

240 ml

60 ml

6 – 9 rolls

500 ml

400 ml

100 ml

10 – 19 rolls

1000 ml

800 ml

200 ml

20 – 28 rolls

* 35mm, 36 exposure or 120 format rolls

Stabilizer


Working Solution

Water

Stabilizer

Film Capacity*


300 ml

270 ml

30 ml

18 rolls

500 ml

450 ml

50 ml

30 rolls

1000 ml

900 ml

100 ml

60 rolls

* 35mm, 36 exposure or 120 format rolls

The Developing Process
The processing order is PreSoak > Developer > Bleach > Wash > Fixer > Stabilizer
Development can be done at a range of temperatures with this kit and several are provided in the instructions.
The temperatures I’ve tried so far are the “rapid” at 45°C and the lower one at 25°C. The lower temperature is easier to maintain but time to develop takes 33½ minutes versus 11½ minutes when done at 45°C.
PreSoak


Temperature

Time

Agitation


25°C

3 min

15 seconds of continuous agitation at start, then 1 agitation every 30 seconds thereafter

45°C

2 min

Developer


Temperature

Time

Agitation


25°C

13 min

Agitate once every 30 seconds

45°C

2 min

15 seconds of continuous agitation at start, then 1 agitation every 30 seconds thereafter

Bleach


Temperature

Time

Agitation


25°C

6 min

Agitate once every 30 seconds

45°C

2 min

15 seconds of continuous agitation at start, then 1 agitation every 30 seconds thereafter

Wash


Temperature

Time

Agitation


25°C

3 min

15 seconds of continuous agitation at start, then 1 agitation every 30 seconds thereafter

45°C

2 min

Fixer


Temperature

Time

Agitation


25°C

7 min

Agitate once every 30 seconds

45°C

2 min 30 sec

Stabilizer


Temperature

Time

Agitation


25°C

1 min 30 sec

Agitate once every 30 seconds

40°C

1 min

15 seconds of continuous agitation at start, then 1 agitation every 30 seconds thereafter
