Thanks for commenting Steve.  This walnut does not need stain.  The color comes out medium brown,  dark brown-red and black mineral streaks.  I use lin-speed after sanding to 600x.  I let it cure for a week then oil sand with 600-800x then use rottenstone to buff the wood barehanded.  After a wipe down with a soft cotton cloth, one or two drops of lin-speed well rubbed in completes the finish.