Re: New KM rust?
If it is/was rust it would leave behind a texture under where the brown spot is/was. When you remove rust there would be pitting from where the Iron turned into iron oxide.Is there a texture is it smooth where you were able to remove the discoloration? If there is no texture then consider the contrary other option is that its a metal Polishing or Emery Compound used in the finishing process.
34" Km Americana Trimetal, KM Jumbo Base, Crown Jewel Bowl, Blue v3 Narbish, CH "Blue Lollipop" Tip
24" Solid Al Fakher, AF hose, MNH Phunnel
30" Solid Al Fakher, AF Hose, Vortex, Blue v3 Narbish, "The Circus" Crown Hookahs Tip
36" Solid Al Fakher, Blue Razan
29" KM Trimetal, KM "Red Lion" Gilded Base, Crown Jewel Bowl, Red v3 Narbish, CH "Solar Flare" Tip