What Causes Yellowing in Clear Resin? Tips & Prevention

Yellowing is a common concern for makers and artists working with clear resin. Understanding what triggers this unwanted change can help you keep your finished pieces looking crystal clear for longer.

Why Does Clear Resin Turn Yellow?

The most frequent cause of yellowing in clear resin is exposure to ultraviolet (UV) light. Sunlight, even from indoor sources, gradually breaks down chemical bonds within the resin, resulting in a visible yellow tint. Additional factors, such as excessive heat or use of incompatible additives, may speed up this process, but UV light remains the primary influence.

How to Slow Down Yellowing

Opting for resins with integrated UV filters is one of the most effective ways to delay yellowing. These formulations, like the “Icrystal” clear epoxy resin, are specifically developed to minimise the yellowing effect over time. Storing your finished resin art out of direct sunlight and away from heat sources will further prolong its clarity. Applying a protective coating or displaying pieces indoors can also help.

When This Matters Most

Decorative pieces: Yellowing impacts the appearance of jewellery, coasters, river tables, and display art.
Functional items: Trays or table surfaces made with clear resin are especially vulnerable if they’re regularly exposed to natural light.

Related guides

While yellowing can’t always be avoided, selecting a quality resin with UV resistance and caring for your pieces goes a long way. For more insights on resin behaviour and best practices, visit our main guide on what causes resin.