'Used' it between the first and second stage of the Bergusia forge.
We succesfully completed the forge and no armor. Inventory was not full and I checked the Postmaster.
Ran it again just in case and still no armor.
Never mind: I read the tooltip. I have to forge a weapon to get the armor.
thanks,
lee
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Are you forging a Black Armory weapon frame? If not, it won't work. Augmented Frames do not count either.