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The chemistry behind new and old book smells
(media.mstdn.social)
Picture based reference guides for anything and everything. If it seems like something someone might print, physically post, and reference then it is a good link for this sub. Remember: Infographics are learning tools, guides are reference tools. Sometimes it's grey.
/r/coolguides mods just let me know if you need access here, just wanted to keep the place available for you