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Favier Explosives: mixtures in varying proportions containing ammonium nitrate, nitronaphthalene, paraffin, and resin; higher nitrated naphthalenes, potassium nitrate, and tetryl may be present.

He said he didn't know why embassy bomb detection equipment found traces of tetryl, a chemical used to boost the power of explosives, on a bag, documents and a cell phone he had with him.

But the documents and Mr. Khan’s cellphone tested positive for tetryl, and the officers arrested him.

Most of the buildings within that restricted area, while in reality enormous, were dwarfed by the vast spaces separating them; for safety-distances are not small when TNT and tetryl by the ton are involved.

After nitration the yellow tetryl separates out, and is filtered off and water-washed till free from acid.