Ha ha, Allan, what I think is I sure wish I had some knowledge of chemistry . . . although so often, a general knowledge isn't "enough" when applied to a speciific problem, and I doubt if the Dutch manufactureres of lead white in the 17th century knew chemical formulae and theory . . . they sure enough knew how to make it, though.
You are providing a more complete picture of the process for me, and I much appreciate that. It's really interesting to note the presence of sulphur compounds (and the subsequent problems with "contaminated" lead white) arises from the use of manure in the process . . . that makes a lot of sense.
I'm pretty certain you'll discover a process that's both workable on a small scale (without having to move into a brewery or a tanning shed or be behind a dairy) that will produce high quality basic lead carbonate!
If I run across any more pertinent lore or advice from chemists, I'll pass it on!
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