Make pottery in Mexico. What should you take?

These bars show a clay from St. Ignacio, Sinaloa, fired at cones 2, 4, 5, 6 and 8. Although it appears this would make a nice red and even metallic stoneware, all have very high porosity. LOI is high, impurity particles gas and cause glaze blisters and pinholes at stoneware temperatures. Better to do what Mexican potters do, focus on low temperatures where glazes fire with fewer defects.
Here are some suggestions:
-Plaster is available everywhere there so make yourself a plaster table.
-If you can bring a 3D printer you can make molds and really impress them.
-They know how to make burner systems, get their help to make a simple kiln.
Bring the following (for materials bring the SDS to show to security or customs officials):
-Tools needed to characterize their clays.
-A propeller mixer to make slurries and grind clay (or purchase a kitchen blender to do blender mixing).
-A 30 mesh Tyler sieve will remove pebbles and organics from a slurry, 50 mesh will remove grit, 80 mesh will remove sand, 200 mesh will produce porcelain smoothness. You'll need to make a vibrating sieve.
-Some bentonite, 1-2% additions can greatly improve plasticity of short clays.
-250g of barium carbonate (in case of soluble salts in their clay).
-250g of Veegum and CMC gum to mix brushing glazes.
-Supplies to make variations of G1916Q base clear glaze and L3685Z3 white engobe. Bring Zircopax to opacify and stains to color the glaze.
-If you need to build a kiln: Sodium silicate to make kiln mortar (likely available locally).
-Tissue transfers, brushes, underglaze colors for decorating white engobed ware.
-Cone 06, 04 cones and supplies to make L4543 clay to make shelves, posts.
Interacting with locals to find supplies and expertise will force you to learn Spanish better. You will find that Latin and South American countries have a much deeper ceramic tradition than we do, so you will discover many new things.

Related Pictures

What temperature is Mexican terra cotta pottery fired to?

Two halves of a terra cotta bowl, one refired

This piece was made in Puebla, Mexico by a potter using traditional techniques and local clays. I have sawed it in half and refired one half at 1850F (Orton cone 04). That half (the right one) has not shrunk, which means it has not exceeded the temperature of the original firing (the piece was likely glazed in the dry state, not bisque fired). Notice how the refire has darkened the body color. This is probably happening because the lead glaze is maturing the surface of the clay (without the glaze it would take a much higher temperature to darken it to this extent, and, that would also entail shrinkage).

Craft store selling traditional terra cotta ware in Mexico 2020

Lead glaze terra cotta for sale in Mexico

This ware is used all over the city by street-side restaurants and food vendors. And routinely used in the house. It is all lead-glazed. They all know to handle it with care to minimize breakage. Surfaces and edges are rough, it is poorly finished but most people value the tradition enough to not even notice. Of course factory-made ware is much stronger and more functional, and cheaper. But at meals and occasions many seek opportunties to use this at the table.

Adobe brick clay - What is it actually?

Adobe brick clay is simply the local clay that is used to make the adobe bricks. Almost always red burning but not always terracotta or earthenware. These clays are almost always suitable for pottery (with more processing). Here is an adobe brick clay from Sinaloa, Mexico. Locals have been making adobe bricks from this for 500 years. Adobe clays are generally just terra cotta bodies. But this one is not. These bars are fired from cone 2 to 7 (bottom to top) or 1125-1225C. They would be firing them to less than 800C, far lower. This clay actually qualifies as a stoneware but they use it as an earthenware. This is not as bad as it sounds. At 800C almost all clays are highly porous and pretty soft - that is actually an advantage for the method of construction used (e.g. watery mortar, easy cutting, good adherence of plaster, insulating value). These same bricks are used to build the kilns and they service well since temperatures never get high enough that they warp or crack.

Links

Projects	Evaluating a clay's suitability for use in pottery Would you like to be able to use your own found-clays in your production? Follow me as we evaluate a mystery clay sample provided by a potter who wants to do this.
Typecodes	Mold making using 3D printing An ordinary consumer 3D printer has many exciting possibilities for making many types of molds, it is a place where people having both artistic and mechanical abilities can get a double the dopamine!

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