Fool-(or should I say kid) proof transparent glaze........anyone have a suggestion?

[Cyndy Littleton]

My studio has begun offering classes to young, potential potters who have lots of great ideas. Unfortunately when they decorate with oxides and then want to over-glaze with a clear, the oxides run. Does anyone have a suggestion for a transparent glaze?

[Wyndham Dennison]

Oxides are expensive and only take a very small amt to influence the glaze color.Generally speaking, don't put oxides on bisk but in a glaze.Or have a clear or white glaze and lightly brush on an oxide was.

Most oxides will act as a flux on a glaze .

Look up clear or satin white glaze recipes on google and make test tiles with light brush strokes of oxides so folks will know what to expect before going crazy with stuff they aren't accustomed to.

Wyndham

[Cyndy Littleton]

Thank you for your recommendation! I was thinking along that line. While I do not instruct the children's courses, I will definitely set up some tiles for the classes to use.

Wyndham Dennison said:

Oxides are expensive and only take a very small amt to influence the glaze color.Generally speaking, don't put oxides on bisk but in a glaze.Or have a clear or white glaze and lightly brush on an oxide was.

Most oxides will act as a flux on a glaze .

Look up clear or satin white glaze recipes on google and make test tiles with light brush strokes of oxides so folks will know what to expect before going crazy with stuff they aren't accustomed to.

Wyndham

[Norm Stuart]

If you're looking for a low-fire ^06 clear, to use over the oxides or other uses, this "Idiot-Proof Clear" may interest you.

Idiot-Proof Clear ^04 - 06   -  $1.51 per pound
90.0%   Ferro Frit 3195
10.0%   Ball Clay OM4
  2.0%   Bentonite  (or use (0.2% Bentone-EW)
  2.0%   Brushing media like CMC or 1% propylene glycol

Ferro Frit 3195 melts at Cone 08. 

Adding the 10% Ball Clay helps suspend the frit and raises the melting temperature to Cone 06.

The iron contaminants in ball clay also add a yellow cast to the bluish clear of the boron frit, resulting in a more neutral-color  clear.

Although not very delicious, this glaze is at least non-toxic if eaten.

[Cyndy Littleton]

You had to have made that name up (LOL!)

With the kids doing mostly sculpture work, this may work. I have all the ingredients on hand. Thank you Norm!

Norm Stuart said:

If you're looking for a low-fire ^06 clear, to use over the oxides or other uses, this "Idiot-Proof Clear" may interest you.

Idiot-Proof Clear ^04 - 06   -  $1.51 per pound
90.0%   Ferro Frit 3195
10.0%   Ball Clay OM4
  2.0%   Bentonite  (or use (0.2% Bentone-EW)
  2.0%   Brushing media like CMC or 1% propylene glycol

Ferro Frit 3195 melts at Cone 08. 

Adding the 10% Ball Clay helps suspend the frit and raises the melting temperature to Cone 06.

The iron contaminants in ball clay also add a yellow cast to the bluish clear of the boron frit, resulting in a more neutral-color  clear.

Although not very delicious, this glaze is at least non-toxic if eaten.

[Norm Stuart]

A certain Lynn Goodman in New York provided the glaze name and recipe in 2006.  I've found it works well.

http://www.potters.org/subject94218.htm

http://www.lynngoodmanporcelain.com/Platters.html

Cyndy shorter said:

You had to have made that name up (LOL!)

With the kids doing mostly sculpture work, this may work. I have all the ingredients on hand. Thank you Norm!

Norm Stuart said:

If you're looking for a low-fire ^06 clear, to use over the oxides or other uses, this "Idiot-Proof Clear" may interest you.

Idiot-Proof Clear ^04 - 06   -  $1.51 per pound
90.0%   Ferro Frit 3195
10.0%   Ball Clay OM4
  2.0%   Bentonite  (or use (0.2% Bentone-EW)
  2.0%   Brushing media like CMC or 1% propylene glycol

Ferro Frit 3195 melts at Cone 08. 

Adding the 10% Ball Clay helps suspend the frit and raises the melting temperature to Cone 06.

The iron contaminants in ball clay also add a yellow cast to the bluish clear of the boron frit, resulting in a more neutral-color  clear.

Although not very delicious, this glaze is at least non-toxic if eaten.

[Nadine Mercader]

Norm what if one is looking for a fool proof cone 6 clear with the same specs, any suggestions?


Norm Stuart said:

If you're looking for a low-fire ^06 clear, to use over the oxides or other uses, this "Idiot-Proof Clear" may interest you.

Idiot-Proof Clear ^04 - 06   -  $1.51 per pound
90.0%   Ferro Frit 3195
10.0%   Ball Clay OM4
  2.0%   Bentonite  (or use (0.2% Bentone-EW)
  2.0%   Brushing media like CMC or 1% propylene glycol

Ferro Frit 3195 melts at Cone 08. 

Adding the 10% Ball Clay helps suspend the frit and raises the melting temperature to Cone 06.

The iron contaminants in ball clay also add a yellow cast to the bluish clear of the boron frit, resulting in a more neutral-color  clear.

Although not very delicious, this glaze is at least non-toxic if eaten.

[Norm Stuart]

I prefer Tony Hansen's silky ^6 clear using Ferro Frit 3249 with 12% magnesium oxide or the similar frit F-69.

http://digitalfire.com/4sight/education/g1214w_cone_6_transparent_b...

I often add the additional 3% magnesium carbonate shown below.

24.8%  Kaolin
23.8%  Silica
23.2%  Ferro Frit 3134
15.2%  Wollastonite
  8.6%  Feldspar, Soda Minspar 200
  3.0%  Magnesium Carbonate

This glaze contains only 6.7% Boron Oxide contributed by the frit.  Quite a number of other cone 6 clear recipes have far more boron and so can tend to develop the bluish white borosilicate crystals known as "boron-clouding" making the glaze opaque in areas, or worse can develop crazing.

A quick and easy solution can be a combination of Ferro Frit 3134 with kaolin, at a ratio of say 70% / 30% depending on how fluid you want the clear  to peak temperature.

Nadine Mercader said:

Norm what if one is looking for a fool proof cone 6 clear with the same specs, any suggestions?


Norm Stuart said:

If you're looking for a low-fire ^06 clear, to use over the oxides or other uses, this "Idiot-Proof Clear" may interest you.

Idiot-Proof Clear ^04 - 06   -  $1.51 per pound
90.0%   Ferro Frit 3195
10.0%   Ball Clay OM4
  2.0%   Bentonite  (or use (0.2% Bentone-EW)
  2.0%   Brushing media like CMC or 1% propylene glycol

Ferro Frit 3195 melts at Cone 08. 

Adding the 10% Ball Clay helps suspend the frit and raises the melting temperature to Cone 06.

The iron contaminants in ball clay also add a yellow cast to the bluish clear of the boron frit, resulting in a more neutral-color  clear.

Although not very delicious, this glaze is at least non-toxic if eaten.

[Nadine Mercader]

That opaque or bluing is what I want to avoid. I will try as you directed with he addition of magnesium carbonate. Thanks for the help.