The RC paper is usually junk.
Agfa Insigna is very tricky and unfortunately doesn't behave like Record Rapid.
I've had pretty good results with some older Agfa MCP 310 - it may well be dependent on the specific coating package at a specific plant - there seems to have been some specific coating addenda that prevents lith happening (and I'm pretty sure it's not the heavy metal salts that makes paper 'lith').
Interesting - all the material evidence I've seen suggested they were at least very close, if not identical - at least with the last generation of RR.
https://unblinkingeye.com/Articles/Lith/lith.html
Warning: you may get trapped in a deep but colorful hole.
I experienced just the opposite. The rc paper I have is still perfect and the fibre is very fogged.Yup, those are some very nice papers. And not only for lith! All of the Agfa fiber based paper I've tried so far has turned out to work great. The RC paper is usually junk.
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