Re: [Ultra-Tech/Fantasy] The One Ring Invisibility vs. TL9 Hyperspectral Goggles?
There is some evidence for the ringwraiths being cold; whether this would apply to a living being using the ring (or just negate the living being's heat signature) is an open question, as is whether the cold is physical or spiritual.
I would figure that a device useful for detecting ghosts will also detect someone wearing a ring. Whether or not hyperspectral imaging will do so is a setting issue, but may have already been established.
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