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When I was making muzzle loaders, I used Potassium Permanganate as wood stain. start with a weak sol. 0.5% in water. More applications make darker, or stronger sol. 5% will give a dark grey to black.
You might try peroxide along with clean dry pine sawdust, then vacuum. !!
I have used spit to remove blood stains for years, works great, but people do look at you sort of funny sometimes. !!!
How about Aloe Vera?