I'm with Sweat.I'll bet it's cosmoline.They cleaned my Scrambler for over an hour,and it still had some cosmoline dripping off it after the 23 mile ride home from the dealer.They didn't get between the fins real good,and there was some running down the cylinders on the cases.Like he said,wipe it off,and see if it comes back.
Cosmoline is brownish and sticky.Wipe your fingers over it and see.The break-in oil Triumph specs is a dino-synth blend,and is thin and slippery,and almost clear.It even looks like cosmoline in your pic.
Don't worry-Be happy.

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Cheers!
Bruce