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Do you have period documentation for this bowl condenser of collecting 
saltpeter?

On 10/7/2013 11:51 PM, john heitman wrote:
> You mine sulfur out of the ground. The easiest way to find it is by 
> smell.  the stuff shows up in wells with a REALLY bad odor.  most 
> often they are salt springs as well.
>
> Its a nice pretty yellow powder.
>
> Potasium nitrate is made by pouring this morning's urine over last 
> nights ashes, turning a bowl over the slush, and allowing it to 
> evaporate. At the end of the day, turn the bowl right side up and 
> collect the crystals that have formed on the surface (use a pottery 
> bowl!). the crystals are the salt peter you seek.
>
> have you become amazed at the ingenuity of the alchemist yet?  I mean, 
> who in their right mind would have thought to do that?
>
>
>
>
> On Fri, Oct 4, 2013 at 7:17 PM, Stefan li Rous 
> <[log in to unmask] <mailto:[log in to unmask]>> wrote:
>
>     On Oct 4, 2013, at 10:36 AM, john heitman <[log in to unmask]
>     <mailto:[log in to unmask]>> wrote:
>
>     > It's also for making gun powder.  It is EXTREMELY fine, and
>     falls apart at the touch if cooked long enough.
>     >
>     > Franz
>
>     Oh! Slaps head. I should have thought of that use.
>
>     So where would they have gotten sulfur from in period times?
>
>     I know that you can get potassium nitrate from things like bat
>     guano, although I'm not sure what processing is involved.
>
>     Stefan
>
>     --------
>     THLord Stefan li Rous    Barony of Bryn Gwlad    Kingdom of Ansteorra
>        Mark S. Harris           Austin, Texas
>     [log in to unmask] <mailto:[log in to unmask]>
>     http://www.linkedin.com/in/marksharris
>     **** See Stefan's Florilegium files at: http://www.florilegium.org
>     ****
>
>