Quote Originally Posted by scheimfluger_77 View Post
Alessandro,

A thorny problem. All of your examples, except the first one, appear to be particulate matter on the surface. Do you use a wetting agent such as Photo-Flo? When you hold the film up to a strong light do the spots appear dark? If so it's particulate matter coming from somewhere. How dust free is your drying environment?

If the spots transmit the backlight then the problem is in the emulsion itself. Possibly from dust on the negative during exposure, the lack of "rapping" on the tank to dislodge air bells, an acid stop bath, or QC in the manufacture. In your first example where spots are visible you appear to have an additional problem of fogging, since they are visible in the frame line.

Over the past year I've been using a university darkroom with supplied chemistry. They don't use stop bath for film and from what I can tell this does not cause a problem when arresting development. I've never processed film that way before but I will now, that's one odor to deal with in the process. Oh, to clarify I do use a water fill/agitate/dump procedure for 3 or 4 cycles to stop development, it seems to work fine and you eliminate the CO2 bubble problem when going from an alkaline to acidic environment.

Steve
I hung up my negative in the shower, after having made a lot of steam with hot water. So dust should not be the problem. Those tiny spots transmit light so they are transparent but can be feel to the touch of the finger.
I use a citric base stop (Tetenal Indicet). I rap the tank (Paterson) on the table to dislodge air bubbles. My fixer is an odourless one (Tetenal odourless fixer). I always use these chemicals as per specs.

Since I'm dealing with Ilford I think QC is not questionable so the problem should lean on my side (processing etc...).

I absolutely rule out the fogging problem.

Do those tiny spots can be traced back to how I store my films in the freezer?