I unpacked decorations from storage and they’re coated in a strange white film. What happened?

In addition, high humidity can cause certain materials to break down or release chemicals that settle as a residue. For instance, metals may oxidize, forming a white powder, while paper and cardboard can absorb moisture, leading to a mildew-like film. Keeping humidity levels below 50% can significantly reduce the risk of this residue forming.
3. Off‑Gassing Plastics and the ‘Bloom’ That Settles on Holiday Decor
Many decorations are made from or contain plastic materials that can emit volatile organic compounds (VOCs) over time, particularly in warm or confined storage spaces. This process, known as off-gassing, can result in a phenomenon called ‘bloom,’ where a white, powdery film settles on surfaces.
Bloom is more pronounced in newer plastic items as they tend to release more VOCs. Over time, as the off-gassing diminishes, the rate of bloom decreases. Proper ventilation and using containers that allow air circulation can help minimize the effects of off-gassing on your holiday decor

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