Dupre Mr Marcy M on tue 26 mar 02
While I was sending the recipe to several others who had requested it
off-list, several more requests popped up. (I never thought such a thing
would generate THIS much interest! :o))
Therefore, I trust the remainder of the ClayArt list will be patient and
tolerant as I post this recipe and chemical analysis to the board. In this
fashion, it is available for all to see, use if you wish, discard if you do
not.
Since Frit 3819 is scarce, I substituted nepheline syenite, one-for-one. I
also recalculated the recipe using Frit 3269, but have not tried it. You
may wish to give it a shot.
I use the smaller fabric paint plastic bottles with fine tips, available at
hobby and craft stores. You might want to try something on the order of a
plastic ketchup bottle, like the ones found in rural restaurants.
Mix the slip, put it into the container, and use on bisque tiles. Pencil
the design directly on the tile (start with simpler designs at first), then
draw the lines with the tubeline slip. Give the bottle a slight squeeze to
get the mix started. Once it has made contact with the tile, you do not
need to squeeze the bottle. Capillary action from the dry tile will pull
the slip out of the bottle.
Once the slip has set, dip or brush for a background, and fill the dams made
with tubeliner using a squeeze bulb. I prefer to use the kind of nasal
aspirator you buy for clearing an infant's nose when it is runny.
Good luck! Steady hand, good designs.
Tig
Herewith is the recipe for tubelining slip:
++++++++++++++++++++++++++++++++++++++++++++
+++ Tubeliner Slip Trailer--Original +++
++++++++++++++++++++++++++++++++++++++++++++
Range: 1-9
Firing type: Ox. or Red.
Glaze type: Slip glaze
Color: White
Surface: Semi-gloss
Transparency: Opaque
Grolleg 36.00 36.00% Health hazard!
Silica 36.00 36.00% Health hazard!
Kentucky OM #4 16.00 16.00% Health hazard!
Whiting 4.00 4.00%
Frit 3124 4.00 4.00%
Frit 3819 4.00 4.00%
-------- -------
100.00 100.00%
Notes:
Mix dry and sieve. Add water to make thin mixture and allow to sit for at
least
24 hours, mixing several times. Decant clear water from top and allow to
evaporate to thick cream consistency. Use in a squeeze bottle with a thin
tip to
outline illustrations on tiles, making dikes for pooling glaze on the
tiles.
Material Hazards:
Grolleg (English china clay) - dust hazard
Silica - dust hazard
Kentucky OM #4 - dust hazard
===========================
Chemical Analysis
===========================
Na2O 0.167 Al2O3 2.216 SiO2 13.340
K2O 0.149 B2O3 0.211 TiO2 0.031
MgO 0.052 Fe2O3 0.032
CaO 0.626
ZnO 0.006
Alumina:Silica ratio is 1.00 : 6.02
Neutral:Acid ratio is 1.00 : 5.52
Alkali:Neutral:Acid ratio is 1.00 : 2.43 : 13.40
Weight percentages:
Na2O 0.93% Al2O3 20.32% SiO2 72.09%
K2O 1.26% B2O3 1.32% TiO2 0.22%
MgO 0.19% Fe2O3 0.47%
CaO 3.16%
ZnO 0.04%
Volatiles:
CO2 1.92%
F2 0.07%
Other 6.90%
Loss On Ignition: 8.16%
Molecular percentages:
Na2O 0.99% Al2O3 13.17% SiO2 79.26%
K2O 0.89% B2O3 1.25% TiO2 0.18%
MgO 0.31% Fe2O3 0.19%
CaO 3.72%
ZnO 0.04%
Expansion coefficient: 52.0 x 10e-7 per degree C
Oxides causing abnormal expansion effects: B2O3
Onset of oxide volatization:
CO,CO2 700 C (c/018) (complete loss)
ZnO 950 C (c/08) (partial loss)
F2 1000 C (c/06) (complete loss)
Na2O 1100 C (c/02) (partial loss)
B2O3 1150 C (c/2) (partial loss)
K2O 1200 C (c/6) (slight loss)
Materials in glaze:
Grolleg (English china clay) supplies SiO2, Al2O3, Fe2O3, and
small amounts of several fluxes.
Silica supplies SiO2.
Kentucky OM #4 supplies SiO2, Al2O3, TiO2, Fe2O3, and small
amounts of several fluxes.
Whiting supplies CaO.
Frit 3124 supplies SiO2, Al2O3, B2O3, CaO, Na2O, and K2O.
Frit 3819 supplies SiO2, Al2O3, B2O3, Na2O, K2O, ZnO, and CaO.
Oxides in glaze:
Na2O is a strong alkaline flux.
K2O is a strong alkaline flux.
MgO is a high-temperature flux.
CaO is a high-temperature flux.
ZnO is a high-temperature flux.
Al2O3 increases viscosity, prevents crystallization, and adds durability.
B2O3 is both a glass-former and a flux over a wide temperature range.
SiO2 is the primary glass-former in glazes.
TiO2 adds opacity and encourages crystal formation.
Fe2O3 is a colorant (tan, yellow, brown, red, and black).
In reduction, Fe2O3 -> FeO, which is a flux and colorant (brown, black).
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