Date: 2012-02-03 09:07 pm (UTC)
From: [identity profile] epoxyde.livejournal.com
Если есть в среде свободный S(2-)-анион, соли свинца растворимые его проявят черной окраской.
Но если он там и так есть, то тогда, наверно, и нет смысла проявлять.
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