How do you touch up albumen? Or can you?

[mossbloom]

I'm learning how to contact-print albumen on prestretched gesso-primed framed canvas (say, 11X14's). It works great, but it's been ugly. I've tried every coating method known to either gender, albumen and AgNo3, and find the best results are one-time foam brush. My albumen's sorta runny, which helps, so I drench it on and watch for bubbles. I've dried single- and double-coating the silver nitrate: there's no great apparent advantage to double-coating, at least in terms of image quality or skipped spots. Double or single, I still miss spots, in random locations. The edges are notoriously difficult, but the ultimate solution to that seems to be a (wood) frame that overlaps the canvas about a quarter inch. But the plain-white-canvas missed areas are driving me nuts. We're talking a couple square cm or less. Of a dozen images made, I might get 3 that have no defects. Thus: does anyone have any ideas about how to touch up an albumen print? The lady at the art supply store sold me every last pencil and pen in the closest-possible shades: they don't even come close. I know the software people say "If you can't fix it, feature it," but this isn't a feature. It's gonna bankrupt me at this rate. My paper albumens are great, and so are my flat-canvas sheets (mostly), but framed is...ugly. Ideas?

Al
moss bloom studio
Cotati CA