General

The trip wire activated a stun grenade - a small device filled with a mixture of magnesium powder and mercury fulminate. The blast didn't just deafen Alex, it shuddered right through him as if trying to rip out his heart. The light from the ignited mercury burned for a full five seconds. It was so blinding that even closing his eyes made no difference.

By hiccup, May 3, 2012.

Found in Alex Rider, Stormbreaker, authored by Anthony Horowitz.