How To Make Brown Underglaze: A Step‑by‑Step Guide for Ceramic Artists
Creating your own brown underglaze gives you control over color intensity, opacity, and the overall look of your pottery. Whether you are a beginner hand‑builder or an experienced studio artist, mixing a reliable brown underglaze is a useful skill that expands your design possibilities. This article walks you through the materials, measurements, and techniques you need to produce a consistent, vibrant brown underglaze that works on both stoneware and porcelain.
Why Make Your Own Brown Underglaze?
Commercial underglazes can be expensive and may not match the exact hue you envision for a specific project. By mixing your own, you can:
- Adjust the depth of color – from a light mocha to a deep chocolate.
- Control the opacity – create a semi‑transparent wash or a fully opaque layer.
- Tailor the flow – modify the viscosity for brushing, spraying, or dipping.
- Save money – bulk raw pigments are often cheaper than pre‑mixed colors.
Materials You’ll Need
- Base glaze (white or clear) – provides the ceramic body for the pigment.
- Brown iron oxide (Fe₂O₃) – the primary pigment for brown tones.
- Cobalt carbonate (optional) – adds a cooler undertone if desired.
- Stainless steel mixing bowl and whisk.
- Digital scale (accuracy to 0.1 g) for precise measurements.
- Glaze testing tiles or small test pieces.
- Protective gloves and mask – handle pigments safely.
Step‑by‑Step Mixing Process
1. Prepare Your Workspace
Lay down a clean, non‑porous surface. Wear gloves and a mask to avoid inhaling fine pigment particles. Gather all tools and pre‑weigh the base glaze if you are working from a large batch.
2. Determine the Desired Shade
Start with a standard ratio of 5 % iron oxide to the weight of the base glaze. For a lighter brown, use 3 %; for a darker, go up to 8 %. Record the exact percentages so you can replicate the color later.
3. Weigh the Pigments
Using the digital scale, weigh the required amount of iron oxide. If you want a cooler brown, add 0.5 % cobalt carbonate to the total pigment weight. Example for 1000 g of base glaze:
- Iron oxide: 50 g (5 %)
- Cobalt carbonate (optional): 5 g (0.5 %)
4. Incorporate the Pigment
Slowly sprinkle the iron oxide (and cobalt, if using) into the base glaze while stirring with the whisk. Mix for at least 5 minutes to ensure a uniform dispersion. Avoid creating air bubbles; a smooth slurry is essential for even application.
