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 ...

Barrels of a highly explosive acid once used to make bombs have been discovered alongside other hazardous chemicals at a warehouse. Officials found 300kg of picric acid at the industrial unit near ...

It was believed to be picric acid. The Courier-Mail understood that it was from a first aid kit from around the 1910s. The authorities set up a 100m exclusion zone until the substance testing ...