How to Prevent Yellowing in Resin Collectibles
Yellowing is one of the most common — and most preventable — forms of resin damage. Understand why it happens and what you can do to stop it.
Many collectors assume yellowing is inevitable with age. It isn't. With correct care, resin figures can remain colour-true for decades.
Why Does Resin Yellow?
Polyurethane resin yellows through photooxidation — UV and oxygen break down polymer chains, producing yellow-brown chromophores. Three accelerators: UV exposure, heat, and off-gassing chemicals from storage materials.
UV: The Primary Cause
Keep figures away from direct sunlight and use UV-filtering glass in display cabinets. See our UV protection guide for full details.
Heat Accelerates Yellowing
Avoid displaying figures near radiators, TV tops, amplifiers, or windowsills in summer. Any surface regularly exceeding 25°C accelerates yellowing significantly.
Storage Materials That Cause Yellowing
- Bubble wrap — off-gasses plasticisers. Use acid-free tissue paper instead
- Sealed plastic bags — trap off-gassed solvents
- Newspaper — acids and inks migrate to resin surfaces
Can You Reverse Yellowing?
Mild yellowing on unpainted resin can sometimes be partially reversed with "retrobright" (hydrogen peroxide gel under UV). However, this risks painted surfaces — experienced restorers only. Prevention is always preferable.
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