How to Make Porcelain Plates

Written by gail cohen
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How to Make Porcelain Plates
Use plaster moulds if you want bas-relief designs on your plate surfaces (Global B2B Network)

Trade routes between China and Italy thrived when Marco Polo brought the first soft-paste porcelain pottery to Florence. Lovingly dubbed "porcellana," these fine clay objects became an obsession of Grand Duke Francesco de' Medici, so he commissioned palace artisans to craft thousands of porcelain plates, challenging workers to experiment with styles, kilns, clay mixes and glazes. Though the studio was dismantled with his demise in 1587, porcelain plate art never disappeared.

Skill level:
Moderately Challenging

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Things you need

  • Plaster plate moulds
  • Lubricant
  • Kaolin clay
  • Kiln
  • Water
  • Glazes
  • Modelling tools
  • Organic sponge

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  1. 1

    Choose between two inter-fitting plaster moulds with concave and convex shapes and one-sided moulds that come in a variety of materials, including styrofoam. Whichever you choose, spray a lubricant over the surface(s) so you can extract the plate without breaking it. WD-40 is recommended; household Pam will do the job, too.

  2. 2

    Knead kaolin clay with water per package directions. Flatten it out with a knife or rolling pin. Using a two-sided mould? Place the clay into one side, and use an organic sponge to tamp it down so it contours to the mould. Using a single mould? "Slump" or "hump" the rolled-out clay into the mould. In either case, use sculpting tools, dental tools or clay crafting instruments and a damp organic sponge to trim and smooth.

  3. 3

    Lower the second mould onto the clay if you're using a two-mold system. Determine how thick the plate will be by the amount of compression you apply to the porcelain plate moulds. Use a damp sponge to compress clay while it's being worked to avoid warping. Skip this step if you're using a single mould.

  4. 4

    Dry the plate thoroughly--up to 48 hours. Remove it from the mould and apply kaolin clay paste to fill or even out blemishes. Smooth out surfaces with fine sandpaper or tools. Clay workers recommend a Sur-form or rasp. This carpentry tool mimics a cheese grater and does a great job evening out porcelain clay. Clean up tool marks using a damp organic sponge.

  5. 5

    Fire the porcelain plate at 980 degrees Celsius. This low-fire temperature is the key to producing the porosity for which porcelain is known. It also prepares the surface for the glazing step.

  6. 6

    Dip plates into a commercial glaze manufactured from pegmatite and quartz and mixed just before application. This clear sealer requires quick dips into the bath. It takes skill and patience to hold the plate while accomplishing this process. Dry the porcelain plate thoroughly---for at least 48 hours---before lightly touching up surfaces with your favourite tool to remove drips, smudges, flaws and uneven patches. Fire the porcelain plate again----this time at 748 degrees C Celsius---to complete the process.

Tips and warnings

  • Satisfy your inner artisan by making square porcelain plates instead of round ones by using plywood to shape the bottom mould and sealed bags of cornstarch to press out the square shape on the plate surface.
  • Unless you're a sculptor, if you want bas-relief designs on the surface of your porcelain plates, you'll have to use moulds with incised designs to achieve that result.

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