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Interesting...this is the first time this has ever happened to me.
I just finished doing some lith printing on some old mystery paper. It's in a DuPont Varigram 8-1/2x11 box, but the paper itself is 8x10, so who knows what it is. Whatever is was, it didn't go too crazy using lith methods. It was predictable infectious development with a pretty sensitive snatch point somewhere between 4 and 6 minutes, exposure times of 2 minutes at f/4, but pretty normal tonally. Just a little creamy in the highlights.
At any rate, this is all beside the point.
On my second sheet, I noticed that the strange fizzing noise I had heard was happening again at the same point in the process. It started about 30 seconds into the stop bath, and lasted about another 20-30 seconds before stopping. I assumed it had been pipes the first time, but this time I put my ear to the tray, and sure enough that's where it was coming from. I assumed that for some reason beyond my chemical understanding, the paper was releasing gases due to something the stop was doing.
Oh well, I figured. The prints were fine, so I kept printing. Every time a print was in the stop, it would happen again right on schedule.
At the end of the session, with the lights on, I decided to process my focusing sheet to investigate further. When it happened in the light, I saw that the bubbles were all coming out of two points (one point each on two edges, about a half inch in from the corners). The points of origin were right on the edge of the paper. The bubbles emerged in a very thin, very neat stream.
What's the deal? Is this by design? It's not a problem. I am just a bit curious.
I just finished doing some lith printing on some old mystery paper. It's in a DuPont Varigram 8-1/2x11 box, but the paper itself is 8x10, so who knows what it is. Whatever is was, it didn't go too crazy using lith methods. It was predictable infectious development with a pretty sensitive snatch point somewhere between 4 and 6 minutes, exposure times of 2 minutes at f/4, but pretty normal tonally. Just a little creamy in the highlights.
At any rate, this is all beside the point.
On my second sheet, I noticed that the strange fizzing noise I had heard was happening again at the same point in the process. It started about 30 seconds into the stop bath, and lasted about another 20-30 seconds before stopping. I assumed it had been pipes the first time, but this time I put my ear to the tray, and sure enough that's where it was coming from. I assumed that for some reason beyond my chemical understanding, the paper was releasing gases due to something the stop was doing.
Oh well, I figured. The prints were fine, so I kept printing. Every time a print was in the stop, it would happen again right on schedule.
At the end of the session, with the lights on, I decided to process my focusing sheet to investigate further. When it happened in the light, I saw that the bubbles were all coming out of two points (one point each on two edges, about a half inch in from the corners). The points of origin were right on the edge of the paper. The bubbles emerged in a very thin, very neat stream.
What's the deal? Is this by design? It's not a problem. I am just a bit curious.
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