On Apr 19, 4:34 pm, Meat Plow wrote:
On Thu, 19 Apr 2007 21:06:37 +0100, N Cook wrote:
What is the white deposit chemically, is it always white, and why does it
always form on the dome end whichever-way-up the valve is mounted.

Oxidized mercury?

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Oxides of Mercury are red or cinnamon in color, and turn skin or other
semi-absorbant surfaces black. Interestingly enough, many compounds
including mercury are similarly colored. The common mercury ore form
is called "cinnabar" for that reason, even though it is mercury
sulfide.

Peter Wieck
Wyncote, PA