A zero-frit transparent glaze hiding in a colored glaze

Share from Insight-live.com (Lab Documentation and Calculation System) by Digitalfire. https://digitalfire.com

The glaze recipe promised more color than it delivered, but delivered something it did not promise, a good transparent. The orange is a mechanism of that transparent.


Tangerine 4 (Orange)

Code #

G3875

Materials Amt
Nepheline Syenite 37.000
Silica 25.000
Wollastonite 20.000
Zinc Oxide 10.000
EPK 8.000
Additions
Red Iron Oxide 1.800
Chrome Oxide 0.200

Total:102.00

Auto Unity Formula

CaO 0.47
K2O 0.05
Na2O 0.15
(KNaO) 0.20
ZnO 0.33
Al2O3 0.30
SiO2 2.71
Fe2O3 0.03

Ratios

Si:Al: 9.0:1
R2O:RO: 0.3:0.7

Expansion

7.5 (Molar:7.3)

LOI

1.5

Cost

0.15 per kg

Notes

*Found on the internet. Although a few good pieces were made from it we found problems:

-It is inconsistent (because of sourcing the color from raw metal oxides)
-The orange is not as bright as desired
-What we got is very different from how the page online presented it
-It dries powdery, does not have enough clay

More importantly, a good clear might be hiding in this recipe (if we remove the colorants).

Pictures

G3875 Tangerine orange mug (M340) at cone 6

Tangerine orange online photo

Tangerine Orange glaze specimen cone 6

OrangeGlaze

G3875 on M370 and Coffee clay.

G3875 on M340 mug , M370/Coffee test tiles

URLs

Glazy page

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Tangerine 4 (Orange)" id="153588" key="iTrzz9oR" date="2023-03-11" codenum="G3875"> <recipelines> <recipeline material="Nepheline Syenite" amount="37.000"/> <recipeline material="Silica" amount="25.000"/> <recipeline material="Wollastonite" amount="20.000"/> <recipeline material="Zinc Oxide" amount="10.000"/> <recipeline material="EPK" amount="8.000"/> <recipeline material="Red Iron Oxide" amount="1.800" added="true"/> <recipeline material="Chrome Oxide" amount="0.200" added="true"/> </recipelines> </recipe> </recipes>

Born: 2019-04-01, Modified: 2023-03-11 19:54:04

Zinc Clear cone 6

Code #

G3875B

Materials Amt
Nepheline Syenite 37.000
Silica 25.000
Wollastonite 20.000
Zinc Oxide 10.000
EPK 8.000

Total:100.00

Auto Unity Formula

CaO 0.47
K2O 0.05
Na2O 0.15
(KNaO) 0.20
ZnO 0.33
Al2O3 0.30
SiO2 2.71

Ratios

Si:Al: 9.0:1
R2O:RO: 0.3:0.7

Expansion

7.4 (Molar:7.2)

LOI

1.4

Cost

0.08 per kg

Notes

*This is quite powdery when dried. Try adding 1% Veegum, that will gel and harden it.

It applies well.
It fires glossy on verticals, but a little pebbly on the inside base of mugs. Needs to be fired using a drop and hold schedule.

As a transparent this has a few important advantages:

-It is just starting to melt at cone 02.
-It contains no frit

Pictures

When thick the glaze become pebbly

This also happens on the inside base of mugs.

P6733 M340 with G3875B clear, 3875 orange

The clear version of the glaze is on the insides of these two, it is crystal clear. This is impressive since the recipe contains no frit and no boron.

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Zinc Clear cone 6" id="154211" key="i7EkmiRj" date="2023-03-11" codenum="G3875B"> <recipelines> <recipeline material="Nepheline Syenite" amount="37.000" tolerance=""/> <recipeline material="Silica" amount="25.000" tolerance=""/> <recipeline material="Wollastonite" amount="20.000" tolerance=""/> <recipeline material="Zinc Oxide" amount="10.000" tolerance=""/> <recipeline material="EPK" amount="8.000" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2019-04-01, Modified: 2023-03-11 19:48:08

Tangerine + Orange Stain

Code #

G3875C

Materials Amt
Nepheline Syenite 37.000 36.27%
Silica 325 mesh (Silica) 27.000 26.47%
Wollastonite 20.000 19.61%
Zinc Oxide 10.000 9.80%
EPK 8.000 7.84%
Additions
*Cerdec 239616 Orange 3.000 2.94%
Veegum 1.000 0.98%
Red Iron Oxide 1.800 1.76%
Chrome Oxide 0.200 0.20%

Total:108.00

Auto Unity Formula

CaO 0.47
K2O 0.05
Na2O 0.15
(KNaO) 0.20
ZnO 0.33
Al2O3 0.30
SiO2 2.79
Fe2O3 0.03

Ratios

Si:Al: 9.3:1
R2O:RO: 0.3:0.7

Expansion

7.4 (Molar:7.2)

LOI

1.5

Cost

0.14 per kg

Notes

*This will test if we can get better color by adding some orange stain.

The silica has been switched to 325 mesh, this will enable better melting so it has also been increased a little also (to reduce the thermal expansion).
The VeeGum addition will make it dry harder and suspend better in the bucket.

Pictures

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Tangerine + Orange Stain" id="234747" key="FiQsyFfj" date="2023-03-11" codenum="G3875C"> <recipelines> <recipeline material="Nepheline Syenite" amount="37.000" tolerance=""/> <recipeline material="Silica 325 mesh" lookup="Silica" amount="27.000" tolerance=""/> <recipeline material="Wollastonite" amount="20.000" tolerance=""/> <recipeline material="Zinc Oxide" amount="10.000" tolerance=""/> <recipeline material="EPK" amount="8.000" tolerance=""/> <recipeline material="Cerdec 239616 Orange" amount="3.000" added="true"/> <recipeline material="Veegum" amount="1.000" added="true"/> <recipeline material="Red Iron Oxide" amount="1.800" added="true"/> <recipeline material="Chrome Oxide" amount="0.200" added="true"/> </recipelines> </recipe> </recipes>

Born: 2019-04-01, Modified: 2023-03-11 19:59:15