It's a paper coating issue. I've had it happen with Fotokemika Emaks, Fotokemika Varycon, Foma 132, and Kentmere Kentona.
Lith has a tendency to reveal defects in the paper that simply doesn't show up with regular chemistry, for various reasons I am unfamiliar with. What's particularly difficult is that it isn't consistent from batch to batch, unless you use something like Ilford Warmtone, in which case it'll be consistently good without such artifacts.
Good luck in sorting it out!
Originally Posted by f/stopblues
No lith with Ansco 130
I am searching for the right magic combination of homebrew developer, paper, and process to lith. I have made some Ansco 130 and am getting excellent results for standard development accross a number of papers. Alas, I tried various tems, up to 33C and solutions, from 1:8 - 1:15'sh and nada - image comes up pretty fast (1-2 minutes) no infectious development and if I leave it longer I get chemical fogging . I burned through a pack of FOMABROM VARIANT IV 123 in the process. Anyone out there who used Ansco 130 to lith? What is your baseline dilution, and temperature?
There are a lot of variables to control and I would welcome a baseline experience in Ansco 130 to anchor my further experimentation.
Ansco 130? That's a regular developer for normal prints, if I am not totally missing the boat. Try the homebrew lith recipes (like this one: http://www.apug.org/forums/forum222/...developer.html) in the Articles section if you need to mix your own. Other than that, try LD-20 or Moersch Easy-lith.
I recently got 7 bad pieces of Fomatone 133 in a row - big white blotches in random places (in Moersch). When I complained to Freestyle this was their response: "This is a Lith thing. It would be interesting to see if it is also happening with standard B&W developer. Sometimes things happen in Lith that wouldn’t ordinarily be caught with standard developer as the manufacturers don’t make their papers with Lith in mind although they do work." Seems Freestyle doesn't really think Foma papers are or should be used in lith.
Foma just changed the formulation of their papers (EU regulations), that's maybe why WHof.
Knowing the process cycle would help a bit!
But, generally, coating defects appear perpendicular to the edge of the paper and not at an angle. Well, I take that back a bit. If the coating machine has a 45 degree turn around, then you can get defects at a 45 deg. angle as well. So, if they are manufacturing defects, I would guess right now that they arose later in the mfg. process. Maybe in cutting or packaging, IDK for sure, but this is my guess.
I cannot see an easy way to get this from the process, but the process cycle would help indeed if it is a process problem.
Oh, BTW, could you see this in the developer?
Thank you for the suggestion ... off to the lab to cook up some Dr. Jekyll No. 1... just waiting on some paper through the post.