В жидкость пропускают сероводород до тех пор, пока она не будет явственно им пахнуть; черный осадок собирают на фильтр и промывают водой; часть жидкости выпаривают досуха в фарфоровой чашке; при этом не остается никакого остатка, что указывает на то, что, кроме осаждающихся сероводородом металлов, в анализируемом веществе нет никаких нелетучих тел.

Последнюю удаляют фильтрованием, а избыток азотной кислоты - выпариванием досуха и получают таким образом совершенно белый сухой остаток, цвет которого уже указывает на отсутствие меди, потому что малейшие количества ее окрасили бы остаток в голубовато-зеленый цвет.

Третью пробу вещества смешивают с безводной содой и нагревают в небольшом углублении на угле в пламени паяльной трубки: вещество при плавлении пенится и оставляет небольшой металлический королек, не образуя на угле налета, откуда, во-первых, можно заключить, что мы имеем дело с металлом, отсутствие же налета указывает на отсутствие свинца, кадмия, цинка, висмута, сурьмы и олова, кроме того, вещество легко растворимо в воде.
Другую пробу нагревают на куске угля в пламени паяльной трубки: она плавится, всасывается углем и, попадая на раскаленные места его, производит вспышку, что указывает на присутствие азотнокислых, хлорновато- и бромноватокислых солей.

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