Experiencing a color change in your polymer clay while baking can be surprising, especially if the intended color was different from the result. Polymer clay can sometimes turn brown in the oven, and this color alteration can be attributed to several factors.
1. Overbaking
Baking polymer clay for too long or at too high a temperature can lead to overbaking. Overbaked clay can darken and change color, often becoming brown or even black.
2. Brand and Type of Clay
Different brands and types of polymer clay have varying heat sensitivity and color stability. Some clays may be more prone to color shifts or darkening during baking.
3. Reaction with Certain Pigments
Some pigments and color additives in polymer clay can react with heat and cause color changes. Certain colors, especially reds and pinks, may be more susceptible to this phenomenon.
4. Contamination or Mixing
Contaminating clay with residual colors or using contaminated tools can affect the color outcome during baking. Additionally, mixing multiple colors can lead to unexpected results if the colors react with each other when heated.
5. Firing Conditions
If the clay is baked in an unevenly heated oven or with inconsistent temperatures, parts of the clay may overbake and turn brown while others remain unaffected.
Preventing Color Changes
To prevent unwanted color changes in polymer clay:
- Follow the recommended baking instructions for temperature and time.
- Use a reliable oven thermometer to ensure accurate temperature control.
- Test new pigments or colors before using them in a project to understand how they react to heat.
- Avoid overworking the clay, which can lead to color shifts.
- Use clean tools and a clean work surface to prevent contamination.
While color changes can be frustrating, understanding the potential causes and taking precautions can help you achieve the desired color outcome in your polymer clay creations.