[pure-silver] What happend?

Hi,

In my work office I have this photograph on the wall next to my monitor:
It's a B&W print of my kids on Ilford MGIV, RC processed in DS-14. I
usually make rather quickly test prints on 8*10 RC, later I decide which
ones I want to reprint in (sometimes bigger format) FB.

This print has been hanging there for about 4 months and has been
"changing" since 1 month or so. The light gray clouds behind the kids
(and other lighter pars) are changing colour to a yellow /brown, quite
nice btw.

At first I assumed I did not fix long enough, or used exhausted fix, and
accepted as a "badge of shame"..;-).. But than I realized that the white
borders stayed nicely white, as well as other lighter than light grey
stayed white, so here is another phenomena taking place, but what.
Attack of pollutants on the silver image? (it was not toned), or
something else?

There are a few small "splotchy" areas in the grey clouds which stayed
grey, so perhaps nevertheless the fixer?

Best,

Cor
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