overall stain(?) on negative

I've been experimenting with getting pictorial gradation from lith film using various developers. The other day I used the metol-glycin FX2 (but it uses metaborate instead of carbonate as the alkali). The film has a curious yellow-orange stain. My first thought was aeriel fog but the unexposed edges of the film (which were covered by the sheet film holder) were clear without any trace of the stain. I haven't actually printed any of the negatives yet to see if the stain is proportional to density (and lack a color densitometer to see if that is the case). But I'm curious as to whats happening with the chemistry here - I'm pretty sure glycin is supposed to be a pretty clean working developer and resistant to aeriel fog. I've used diluted D23 (metol based) before and that was pretty clean. Any hunches what I'm seeing here? Thank. DJ

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