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Susan, thanks for the run-down on the medium. Not unusual materials, and should have been "fat" enough for a finish sheen.
Alizarin and sap green would not be problematic as glaze colors, but umbers, especially burnt umber, are really prone to "sink".
Some mediums of similar composition can be "bullet-proof".
The less you do, the better it will be in the long run. You can consider oiling out the offending passage when it's thoroughly dry, I still think retouch varnish is the best immediate short-term answer.
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