Help, mixed film rolls.

After shooting gymnastics this evening I stupidly mixed two rolls of

film. One roll is a two stop push and the other is a one stop push.

Is there anything that my pro lab can do to determine which is which?

Not really, film needs to be developed in pretty much total darkness so they can't really check density until it's developed in which case it'll be too late.

Can't they do a "snip" test or something of the sort, where they cut off a piece and process it first?

 

Whether that works or not, you can develope one roll first- and find out which it is- and then process the second correctly. You have a 50% chance of getting the first roll right, pretty near 100% on the second roll.

 

And perhaps someone else can answer- on that first roll, is it best to overdevelope by two stops or underdevelop?

Go for the one stop push on the first roll, if it's the right processing, you'll save the higher quality one, if it's wrong, you'll ruin the lower quality one?

The snip test should do it. Otherwise if you exposed a 400 ASA film at 800 ASA and a 400 ASA at 1600 ASA, I would go with the two stop development push. You would get a denser negative with the 800 ASA overdeveloped but the detail would be there. Under developing the 1600 ASA would get a thinner negative with loss of detail.

I phoned my sales rep this morning to communicate my problem. Snip test is the solution. You can expect to lose a few frames in the process.