For this I will start with 800 grit maybe 1000, good papers and not the rubbish sold on ebay, then take it on up through 1200, 1500, etc etc to 8000 grit and then finish with a talc powder and water compound I mix myself and work with cotton cloth.
That should do the job well enough to bring out the wootz if it is wootz, and if it is not wootz as I suspect then whatever Damascus laminate type build is there will certainly show up.
Snody