Glue in enlarger lens groups

[Volvospeed]

Is it really that hard to spot when it goes bad? Second enlarger lens that I have received this month that is supposed to be "Mint" "No mold" "no dust". I guess I should start asking is the glue is delaminating. Here is the latest sample:

"Professional" photographer said he inspected it and its good as new. And people why why I think half the "Pros" are on that dust.

 

[John Koehrer]

Funky looking stuff. But I've never seen separation like that. Usually it becomes apparent around the edges of the elements, not scattered throughout the lens like that.

 

[Volvospeed]

Have a old Nikkor that has that along with two ebay lenses now. I think my new rule of thumb is going to be no used enlarger lenses. I wonder if its age or heat thats causing it though. This lens was a fairly new Rodenstock so I am leaning towards heat. Who knows.