High Density Resonance Coating is an energy-absorbent coating used by stealth Martian military ships to avoid detection.

Four thousand liters of the coating were stolen by the OPA on their raid on Callisto.

In the twentieth-century, there is a analogous composite , known as Radar-absorbent material or Radar-absorbent paint which accomplished the same purpose, which was used on stealth aircraft like the SR-71 Blackbird (Reconnaissance plane), F-117 Nighthawk (Stealth Fighter), and Northrop Grumman B-2 Spirit (Stealth Bomber)

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