Silver Fulminate is the highly explosive silver salt of fulminic acid with the formula AgCNO. Silver fulminate was first prepared in 1800 by Edward Charles Howard in his research project to prepare a large variety of fulminates. Along with mercury fulminate, it is the only fulminate stable enough for commercial use. Silver fulminate is chemically very stable, not decomposing after years of storage. Like many silver salts, it darkens with light exposure. Silver Fulminate is only slightly soluble in cold water and can be recrystallized using hot water. Silver fulminate is a primary explosive, but has limited use as such due to its extreme sensitivity to impact, heat, pressure and electricity. Detonators using silver fulminate were used to initiate picric acid in 1885, but since have only been used by the Italian navy. The current commercial use has been in producing non-damaging novelty noisemakers as children's toys and tricks. Fulminates are very toxic, about the same as cyanides. Silver Fulminate is well known to cause a dermatitis which has been termed ‘fulminate itch'.