The oxide wash is an essential technique for revealing contours, enriching textures, and adding depth to creations. Used in ceramic decoration, it highlights the details of a piece after the bisque firing and creates natural, elegant patina effects.
Easy to prepare and apply, the oxide wash appeals to both beginner and professional ceramicists seeking expressive, controlled finishes.
What is an oxide wash?
An oxide wash is a mixture of natural oxides or ceramic colorants (iron oxide, copper oxide, cobalt oxide, manganese oxide...) diluted in water.
Unlike a glaze or slip, it does not form an opaque layer. It acts as a patina, penetrating the recesses and highlighting engraved, stamped, or textured surfaces.
If the oxide wash technique is compared to painting techniques, it is closest to watercolor.
Depending on the type of oxide used and the ceramic firing temperature, the effects obtained vary considerably.
Why use an oxide wash in ceramic decoration?
The oxide wash is particularly recommended for:
- Highlighting contours and textures
- Accentuating engraved or sculpted designs
- Creating an aged or patinated effect
- Adding contrast under a transparent glaze
- Enriching a surface without obscuring the modeling work
It integrates perfectly into decoration techniques on bisque, earthenware, stoneware, or porcelain.
How to apply an oxide wash?
Application on bisque
The most common method involves applying the oxide wash to a piece that has been bisque fired:
- Prepare your mixture (water + ceramic oxide).
- Apply generously with a brush or sponge.
- Leave it to penetrate for a few moments.
- Wipe off the excess with a damp sponge.
The pigment remains concentrated in the recesses and immediately reveals the design.
Under a transparent glaze
To set and intensify the effect, you can apply a transparent glaze after the oxide wash has dried, then proceed with the final firing.
This technique allows you to:
- increase color depth
- protect the surface
- achieve a glossy or satin finish depending on the glaze chosen
Note: the final result will depend on the firing temperature and atmosphere (oxidation or reduction).
Which oxide should you choose for your oxide wash?
The choice of coloring oxide directly influences the final color:
- Iron oxide: brown, ochre, or black depending on dosage and firing
- Copper oxide : green to turquoise in an oxidizing atmosphere
- Cobalt oxide: intense blue, very powerful
- Manganese oxide: dark brown to purplish shades
- Chrome oxide : bright green, very powerful
Each clay (earthenware, stoneware, porcelain) reacts differently. It is essential to perform firing tests before any production.
Technical tips for a successful oxide wash
- Always mix thoroughly: oxides quickly settle at the bottom of the container.
- Work with protective equipment when handling powders.
- Test different dilutions to adjust the intensity.
- Record your dosages precisely to reproduce your effects.
- Adjust the concentration according to the porosity of the bisque.
The oxide wash: a simple technique with professional results
The oxide wash is an accessible technical solution that allows you to transform a surface by revealing every detail of the modeling. Used alone or combined with a transparent glaze, it offers great decorative richness and adapts to all styles, from the most traditional to the most contemporary.
Exploring coloring oxides and experimenting with different firings allows you to open up an almost infinite creative field.
