Thank you.
After the aquafortis, the stock wouldn't turn brown no matter how much heat was applied. It just turned a dark olive. I've read that this can happen once in a blue moon to some stocks due to the way they grew, mineral content in the soil, etc. Who knows? Anyway, I fixed this by diluting red and brown stains with 50% alcohol and applying several coats until the green was gone.
It's not the color shade I had hoped for, but under the circumstances it turned out alright.
See post #1329444 aquafortis gone bad. for more details.