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One of the ships was a Belgian relief vessel; the other was the SS Mont-Blanc, a French munitions ship packed to the gills with explosives such as TNT, picric acid, benzol and guncotton.

During the first world war, when DNP powder was combined with picric acid to make howitzer shells, hundreds of workers in munitions factories in France and the US became ill – and 63 died – after being exposed to it.

Picric acid, another ingredient, can be explosive; during World War I, it was used in artillery shells.

Cells were washed with serum-free media then fixed with a modified Karmovsky’s fix of 2.5% glutaraldehyde, 4% paraformaldehyde and 0.02% picric acid in 0.1M sodium caocdylate buffer at pH7.2.

Recently, eosin has been used to colour red and picric acid for yellow, both well diluted with water.