Charlie on fri 14 aug 98
hal mc whinnie wrote:
>
> ----------------------------Original message----------------------------
> what about percent, it looks like this is a variation on the 40 30 20 10
> percent formaulas which could then be done either by weight or by volume
> On Tue, 11 Aug 1998 09:19:45 EDT Joseph Herbert writes:
> >----------------------------Original
> >message----------------------------
> >Charles Riggs wrote:
> >
> >"It's a 4/3/2/1 glaze by parts (scoops...what ever).
> >
> >gerstley borate-------------4
> >bone ash--------------------3
> >nepheline syenite-----------2
> >copper carbonate------------1
> >
> >have fun!"
> >
> >It should be pointed out that parts by volume - which this seems to be
> >- is
> >not the same as parts by weight. So if the recipe is given in parts
> >by
> >volume, be sure to use volume measures like cups, quarts, liters or
> >cubic
> >centimeters. If the recipe is given in parts by weight - as most are
> >- be
> >sure and use weight measures like grams or pounds or ounces (not fluid
> >ounces).
> >
> >Picky, Picky, Picky
> >Joseph Herbert
> >JJHerb@aol.com
> >
>
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Hal
I haven't tried this one by percent yet. The book that I got it from
years ago had "p" after each figure. I just figured them meant parts
as others had % noted. Yes, I know, p could stand for parts or
percentage but......
I have made other raku glazes like the Copper Sand/Hawaiian Blue Raku
using both methods....
Formula is always a variant on the following:
Gerstley Borate-------------80%
Bone Ash--------------------20%
Copper Carb----------------- 5%
Cobalt Carb------------------2.5%
Tin Ox-----------------------1.3%
There was no change observed when it was mixed by parts/volume:
GB---------------------------8
BAsh-------------------------2
Copper-----------------------.5
Cobalt-----------------------.25
Tin--------------------------.13
For those trying to figure out how to come up with a "thirteenth part"
you can take a scoop and put it on a smooth surface. Take a straight
edge and split the powder into two even piles. Now split one of these
piles(that would be .5) into half to make .25. Do it again and you'll
end up with .125 of a scoop. You just keep subdividing the piles
smaller and smaller until you have close to the correct amount.
This ain't rocket science folks but if you have formulas that call for
parts/volume and you don't want to large numbers of parts then this
works just fine. Also if you haven't come up with the 130.00 dollars
for a gram scale yet this doesn't have to stop you from trying small
batches of raku glazes.
Charlie Riggs
Still in Carthage
Where the mower refuses to start and the weeds are growing REAL fast!!
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