[pure-silver] What happened? CORRECTION

In my case it's Ilford MG IV RC as well, 16"x20" size. 
I have maybe 8 prints in total with this effect.
I just made a close look at the 4 I have here at the office and I'm pretty 
well 
convinced that its insufficient fixing and or washing combined with 6 
years
in an office with fluorescent lighting, laser printers, photocopiers, ...

I'm much more careful in my processing now.
Sandor 

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