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Hello everyone. In follow-up to the topic of protecting ebonite and celluloid (cellulose nitrate) started in this thread: https://www.fountainpennetwork.com/forum/topic/332509-experiments-to-re-blacken-hard-rubber/page-2?do=findComment&comment=4301019 I've been going down the rabbit hole of researching HALS and other chemicals that offer protection against UV light-induced oxidation. Something that would act as a moisture barrier would be nice as well. HALS and related chemicals can ostensibly be purchased, but the myriad variations and solubilities have me baffled. I found a resource on conservation of paintings https://www.conservation-wiki.com/wiki/VII._Additives but it doesn't really answer my question: what would be safe to use on a vulcanite and/or celluloid pen that would protect it from UV light and water, and can I apply it safely to these surfaces? Any help would be appreciated. And please be gentle - biochemistry was my major in college but that was decades ago. Nick