Let me say up front that I haven't tried this yet, but I believe if you use ordinary beach sand, blasting sand or sand box sand (yea the stuff they sell at Homedepot or you bring home from the beach in your shorts) it should give you the results you want. I suggest you try it on a piece of scrap Titanium. It certainly won't cost you much but your time to test it out.
Jim Arbuckle