Strange speckled emulsion

[pstake]

This is CMS 20 processed in Caffenol LC+C.

I have used this combination before and am just getting to where I get pictorial contrast.

But now I'm getting these weird black spots.

Any idea why? I'm thinking this is a chemistry-related issue, something to do with bubbling perhaps?

 

[AgX]

I see two kinds of black spots:

those sharply defined ones of max.D

those tiny points of lessser density with kind of halo

 

[MartinP]

Black spots = clear areas on the film? Or almost-clear? Is the emulsion actually missing in those spots, ie. is there a physical hole, or is it simply a contiguous area of gelatine with no image in?

It could also be a very dirty camera or film roll if there is no emulsion damage, just an area with no developed silver (underneath the dust/dirt at time of exposure) though this is less likely especially looking at example-1.

What are the recommendations for stop-bath pH with this film, and did you follow them (thinking of the well known problem with a different sort of film completely).

I'm curious about what you find as the reason(s). Please keep us posted.

 

[pstake]

Black spots = clear areas on the film? Or almost-clear? Is the emulsion actually missing in those spots, ie. is there a physical hole, or is it simply a contiguous area of gelatine with no image in?

It could also be a very dirty camera or film roll if there is no emulsion damage, just an area with no developed silver (underneath the dust/dirt at time of exposure) though this is less likely especially looking at example-1.

What are the recommendations for stop-bath pH with this film, and did you follow them (thinking of the well known problem with a different sort of film completely).

I'm curious about what you find as the reason(s). Please keep us posted.

I think we can rule out the dirty camera or film roll. The camera was a very well-kept Contax 139Q that is basically pristine, and a Tessar 45 that's been recently CLA'd.

The film, I pulled straight from its container, and it's been stored in the freezer since I bought it.

Also, I did not use any stop other than water.

Directions for the Caffenol LC+C recommended allowing it to sit for 5-10 minutes after mixing it to allow "micro bubbles" to dissipate. I'm wondering if this is somehow the result of that.

This was also stand developed so I don't think agitation would play a role, although I did have to (carefully) move the tank from one room to another right at the beginning of development.

 

[snapguy]

you would not believe me

I would suggest you put too much cream and sugar in your coffee developer but...

 

[pstake]

Black spots = clear areas on the film? Or almost-clear? Is the emulsion actually missing in those spots, ie. is there a physical hole, or is it simply a contiguous area of gelatine with no image in?

There are no physical holes in the film. I'm not sure how to tell the difference between clear / undeveloped spots and spots that have no emulsion. I will take pictures of the negatives and post them later today.

 

[timor]

How many rolls of film came out like this ?

 

[pstake]

Just one so far. This was one from a twin pack.


Sent from my iPhone using Tapatalk

 

[timor]

Did you examine the felt of the cassette ?