Brad,
If it was Mine, I,d go with Peters or Simons advice, but I,d rather use Aluminium oxide as its a bit more forgiving than sand, Two links below regarding a bayonet I did.
The stuff for doing the whole process is available but it worked out an expensive option to me so experimented.
There is a cold oxide kit you can get from Caswell, I,ve used this a few times and does produce various results it does a good job on 1907 bayonets, after experimenting you can achieve a finish that is a cross between bluing and phostphate, I,m sure this (the Caswell kit) has very similar ingredients to what DRP uses.
Caswell do other kits for various metals.
Black Oxide Kits - Metal Finishing Solutions - Caswell Inc
Jungle Carbine Bayonet Repair
Home DIY phosphate/ parkerizing process