Fredrick Paget on mon 26 apr 99
Everybody is guessing what this is and what the questioner wants it for.
Calcium sulfide is used as a winter dormant plant spray to clean up fungus
problems such as peach leaf curl. It is called lime-sulfurspray.
We used to make our own by boiling some sulfur with lime in water. Makes
calcium polysulfide. Sort of an orange smelly liquid.
I wonder what it would be used for in ceramics? Maybe a component in an
exotic lustre glaze? Could it be used to make silver sulfide? That should
be an easier route than generating H2S to make it.
Fred Paget
--- Randall Moody wrote:
> ----------------------------Original message----------------------------
> I have some recipes for underglazes (circa 1952)
> and am having problems
> finding one of the ingredients. The ingredient is
> calcium sulfide. Is it
> known by another name and where can it be found? I
> have not seen it listed
> in any of my suppliers catalogues. Any help would be
> appreciated.
-
From Fred Paget, in marvelous Marin County, California, USA
Randall Moody on tue 27 apr 99
> Everybody is guessing what this is and what the questioner wants it for.
> I wonder what it would be used for in ceramics? Maybe a component in an
> exotic lustre glaze? Could it be used to make silver sulfide? That should
> be an easier route than generating H2S to make it.
I am going to post the recipe just as soon as I can find it again. I
found the list of underglazes here on Clayart a few months back. I am now
not sure if it is sulfide or sulfate. The recipe is for a red underglaze. I
am now considering using a Mason stain. Can any one recommend a good crimson
red. Many of the "reds" I have tried are actually reddish browns, and I do
not want that. Any help would be appreciated.
Randall ... venturing boldly into the world of audacious colors!
Anne Hunt on thu 29 apr 99
Fred! Stop bragging about being in Marin!
For both you and Randall, here's a possibilty with the calcium sulfide:
I'm not a "glaze person", o.k., and don't know my -ites,-ates,and -ides,
BUT-- is this stuff a metallic salt? If yes, how toxic is it? (is there
someone named Monona out there?) Guess it can't be too bad, if it's used in
agricultural applications.
Also, if yes, it might be good for a saggar colorant. Kind of odd that
many of them have gardening and/or killing-type uses :>) i.e., for copper
sulfate coloring, use Miracle-Gro; for iron sulfate, use Moss-Out; for
magnesium sulfate, use epsom salts (which is a soil treatment to prevent
black-spot on roses--will see if it really works this year).
For sponging or spraying solutions in saggar/sawdust firing, dissove @
1/2c. metallic salts in 1 qt. warm water. Filter thru paper coffee filter
prior to use in a sprayer.
For silver nitrate, specifically, use 1 oz. silver nitrate to 3c. water.
How many questions have we begged here? Have fun!
anne in sequim
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