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(a) The test tube containing polyaniline before nitric acid addition. (b–d) Dropwise addition of the acid sparked ignition, emitting an intense burst of flame. (e–top) The starting material used for the reaction; the dark green hue of polyaniline is indicative of its conductive state. (e–bottom) The residue within the tube was collected and washed extensively to afford a fine dark-brown powder.
