Diazo salts turn blue when exposed to ammonia Diazo film is used as a medium for storing the working copy of a silver hallide film Diazo is not recommended as and archival storage media, however it is quite durable and resistant to scratching
A combining form (also used adjectively), meaning pertaining to, or derived from, a series of compounds containing a radical of two nitrogen atoms, united usually to an aromatic radical; as, diazo-benzene, C6H5