Hi,
I'm new here. I live in central NJ, and recently had my Dad's old Contax iia cleaned up and I've been running some film through it. I have one roll of Tri-X ready to process and one roll of Kodak 400 just back from the photo shop. Believe it or not we have an actual 1 hour photo place near by.

The plan is to try semi-stand developed caffenol, probably CL(CS) but there are two adjustments I'm going to need help with:

1. House is cold so a pint of water on the counter or in the bathroom settles to around 16C. So what is the recommended adjustment factor? Googling tells me 10-20% per degree Celsius so that's close to double the stand time. Or is it a different adjustment factor for stand development? Or should I consider using the microwave to bring everything up to 20C and put the tank in the oven with the light on. I didn't check ambient temp there yet. I wanted to do CL(CS) but since house is so cold the temps will never rise. Unless I try the oven which just occurred to me this morning.

2. It's an old camera and the shutter is clearly off for 1/500. First two rolls were almost all Sunny 16 so shot at F/16 and 1/500 sec. I assumed that higher speeds would be more accurate but Contax's are funny that way and in hindsight I should have started with slower film and 1/00 sec, and bracketed more. First color roll is underexposed by 1 to 2 stops. So can I push Caffenol and by how much?

In short, I need to extend develop time for both a cold house AND possibly underexposed film. Am I "pushing" my luck?

Thanks
Bill

Large cooler to make a warm bath for your chemical bottles to sit in, is what I read, when I was concerned about my cool basement - never had to implement, basement turned out OK.

Yea, good advice. Right after I posted this I thought about a cooler filled with warm water. BTW oven is too warm. It's over 23C. So, I'll try the cooler filled with 20C water. Anyone know if push processing is more concentrated formula, like Caffenol CS(XS), or more time? In any case I'll try the Caffenol CL (CS) starting at 15C and then into the 20C cooler bath for 70 minutes. Worse comes to worse I ruined an old roll of Tri-X. No matter what it's a data point.

hi bill
as someone who LOVES caffenol I wouldn't semi stand with it but that's me.. caffenol is a low contrast developer as it is, and stand / semi stand might be looking for trouble.
I hope you report back about your experience!
John

CL(CS) is better in full stand, with less apparent grain, but you need a little bit of Potassium Bromide (Kbr) as restrainer for perfect even development.