慢干胶（例如PVA胶）在制作汉服发饰时可能因受潮、阳光照射或时间长了而变色。这种变色通常是由于胶水中的某些成分暴露在外界条件下而引起的。为防止变色，存放慢干胶时应避免高温、湿度和阳光直射，保持胶水容器密封。如果发饰已经变色，可尝试轻轻擦拭或使用适当的清洁方法来修复。

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