Kevin, in a different secion G.H. tells how to remove the image stain (but for a too-dense neg, which I think is irrelavent in your case...):(posted 8916 days ago)"It is possible to remove stain...In most films the stain contributes approximately 40% of the total negative density, so it's removal reduced density significantly. Immerse the fixed, wet negative into a solution of acetic acid and sodium sulfite (1/2 oz. of 28% acetic acid and one teaspoon sodium sulfite per quart). Leave the negative in the solution for three minutes and then wash it." Gordon Hutchings
...Don't know if this is helpful to you or not, since he doesn't say how to bring the stain back, for which you'll need other posters...shawn