stock
Mr. A:
It will stain the stock but won't produce the " fiddle-back or "tigertail" striped look.
What you're doing with the acid is etching or "burning" the sofe areas of the wood. (these chemicals will need a doctors prescription).
Mike Tocci used to make a solution that was very good and you could call Mountain State Muzzle-loading in Parkersburg W. Va. and talk to Ed Cain about his recommendations - they have several of these finishes.
As you know, curly or striped maple will take treatments many different ways with several different results.
Potassium permanganate will also fade with age in sunlight. You can also treat it with a blowtorch like old Hal Hartely did but you need to be very expert to do it - I've never tried it.
Type Mountain State Muxxle-loading in your computer.
Harry B.