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jrgpots

Member Since 15 Mar 2013
Offline Last Active Today, 02:01 AM
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Posts I've Made

In Topic: Iron Speckles

12 April 2015 - 08:50 PM

I remember an organic chem lab I had to take. I made vanilla crystals which normally are large and white. Mine were small and green. The size came from being too much in a hurry. I can buy that....But the green color? The mass spectrometer showed copper in the mix. It turned out that I used an old chrome plated scoop to measure ans stir my soln. The chrome had worn off and the copper metal was exposed to the acidic solution. The result...green crystals.

It comes to mind every time I have an unusual outcome. When it comes to glaze making, it is ever present on my mind.

Just reflections.


Jed

In Topic: My Extra Large Mug Is On Tv Tonight

09 April 2015 - 09:58 PM

Cool...a nice pat on the back...

Jed

In Topic: Iron Speckles

07 April 2015 - 11:08 PM

Wallastonite can have many impurities,such as garnet as mentioned in digitalfire. Could this be the source of your specks? I would try a different source of this ingredient.

That's my guess.

Jed

In Topic: Help With My Nuka Glaze

29 March 2015 - 10:19 PM

Like I said precious material....

Min, I was hoping that the ferro 3124 would boost the Aluminun and lower the melting point. I may be way too low on the amount of the frit, because I have not achieved a good melt yet. Adding more 3124 should add Al and drop the melting point.

Jed

In Topic: Help With My Nuka Glaze

29 March 2015 - 10:09 PM

Where are you getting your rice husk ash?
 
best,
 
.......................john



A friend in Ausrtalia traded me some tumble weed ash for rice husk ash. I don't have a lot so I feel that every time I try, I'm wasting precious material.

Jed

Okay, I'll take a stab at this but with a huge caveat or 3. I used the rice hull analysis from Insight and entered that into the materials data table plus I couldn't find a walnut ash analysis so I used the Insight one for hardwood ash. Either way ash analysis is going to be iffy to say the least.
 
If you have a target formula you are aiming for I can fiddle the recipe to what you are looking for. I know diddly doops about Nuka glazes so I'm only going by the chemisty. Silica and alumina are both really low, do you have a ^6 Nuku recipe to compare yours with?  (I included the bentonite in the formula)
 
 
 Rice hull ash            31.22
 Hardwood Ash         31.20
 Custer Feldspar        23.10
 Ferro Frit 3124          12.00
 Bentonite                   2.50
                         100.02
 
 CaO       0.31*
 MgO       0.25*
 K2O       0.28*
 Na2O      0.07*
 P2O5      0.07*
 TiO2      0.00 
 Al2O3     0.12 
 B2O3      0.05 
 SiO2      1.79 
 Fe2O3     0.00 
 FeO       0.00 
 MnO       0.02
 

 Calculated LOI:    2.41
                 Imposed LOI:        
                       Si:Al:   15.56
                      SiB:Al:   15.97
           Thermal Expansion:    9.31
              Formula Weight:  193.17
 
Hope this is of some help and not just a bunch of gibberish.
 
Madeleine