A duranium shadow was a type of phenomenon involved with false sensor readings of weapons.

In a confrontation with three Cardassian Galor-class-ships shortly after the discovery of the Bajoran wormhole in 2369, Major Kira Nerys and Deep Space 9 used a combination of thoron fields and duranium shadows to create the appearance that the space station was bristling with armaments. (DS9: "Emissary")

Prior to the First Battle of Deep Space 9 in 2372, the Martok Changeling claimed that DS9 was again using duranium shadows and thoron fields to create the impression of massive armaments. However, since the 2369 incident, the station's defenses had indeed been upgraded with numerous phaser banks and about five thousand photon torpedoes. (DS9: "The Way of the Warrior")

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