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It used magnesium oxide boards, which do not burn, during testing and did not reveal this in marketing literature.

The magnesium formed a thin layer of magnesium oxide on the tantalum surface that appears to keep oxygen from getting through.

The inquiry heard 8mm fibre cement panels were added over the magnesium oxide to "conceal" its presence, making the whole system almost flush - but for the 2mm difference.

That reaction would leave magnesium oxide powder, which when spread thin would rapidly react with CO2 from the atmosphere, re-forming magnesite, completing a cycle that could be repeated over and over.

The safety data sheet for Instantaneous Blast says that it contains diiron trioxide, magnesium oxide, zinc metal, potassium perchlorate, aluminum powder zirconium powder, and lead dithiocyanate, among other metallic compounds.