How would you detect sulphur?

Explanation

(i) To a portion of the Lassaigne.s extract, freshly prepared sodium nitroprusside solution is added. If deep violet or purple colour is formed, the presence of sulphur is confirmed.
`underset("Lassaigne.s extract")(Na_(2)S) + underset("Sodium nitro-prusside")(Na_(2)[Fe(CN)_(5) NO]) rarr underset("Purple colour")(Na_(4)[Fe(CN)_(5)NOS])`
(ii) To another portion of Lassaigne.s extract, acetic acid and lead acetate solution are added. If black precipitate is formed, sulphur presence is confirmed.
`underset("Leadacetate")((CH_(3)COO)_(2)Pb) + Na_(2)S rarr underset("Black precipitate")(PbSdarr) + 2CH_(3)COONa`