Dissolve the picric acid in water, add sufficient sulphuric acid to give the mixture a slightly acidulous taste, and then add carmine of indigo according to the shade of green desired. To dia silk ...

Picric acid removed by the Guardia Civil bomb squad. The Guardia Civil removed several bottles of this substance from the ...

Northwestern Oklahoma State University (NWOSU) announced that the hazardous substance was a vial of picric acid. The substance was recovered by faculty during a routine chemical inventory.