In a message dated 96-09-18 11:42:26 EDT, you write:

> And another:where does the lead carbonate come ?
>
>

Lead oxidizes to Lead Oxide, or Lead Hydroxide, (Lead Hydroxide = Lead Oxide
+ Water) then reacts with either Carbon Dioxide in the air (suspect less
likely) or with Carbonates in water (suspect more likely) and Bingo!

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