wat method wud i use to wheather a knife for a accurate rz h9 look?
go to a craft store and buy a “sophisticated finishes rust kit” it contains a bottle of iron filing paint and a bottle o ammonia/copper sulphate solution. dab small patches of the iron paint on desired parts of the blade and wait for it to dry. then get a tissue, place it over the knife so it covers the whole blade, and use a makeup sponge to dab the rusting solution onto the tissue until it is well-soaked. wait for it to dry. the parts with iron paint will be completely rusted and the rest of the blade will be tarnished. scrub the blade gently with a wet sponge. repeat process with the other side of the blade. you can also do this to the rivets. (no iron paint needed) good luck! 
If its a real knif or made of steel just wet the blade and stick in the ground for about 48hrs…You would be surprised at the results you can get and its natural…Its what I did and the blade turned out great…But mine is made of steel…Later man
Get some wet and dry fine grit sandpaper and sand the entire blade, and then wrap it in wet toilet paper. Leave it alone for 24 hours and you’ll have your rusty old-looking knife.