I'm currently reading a rather dated and somewhat unsatisfactory history of alchemy. One of the questions it has left me with is how much impact alchemy had on other fields, whether practical or philosophical, before, say the 17th century?
Writers on alchemy also often wrote on other philosophical subjects - sometimes with great influence. How much did alchemical theories actually influence theology or cosmogony? On the practical side, were forges, dyers, tanners, etc. using insights from alchemy? If so, how was this influence disseminated?
I could go over this again, I love the history of alchemy (I got a whole podcast on it http://historyofalchemy.com ) but I think I've answered all of this before.
If you're just interested in some general background, browse some of the previous answers on the topic:
https://www.reddit.com/r/AskHistorians/wiki/profiles/bemonk
More specifically, I gave an overview of the history as a whole in an AMA on this subreddit here.
scientific stuff that came out of alchemy
Here's about how it turned to chemistry https://www.reddit.com/r/AskHistorians/comments/23rrlf/when_and_where_did_alchemy_and_chemistry_become/
I recently did an episode on how alchemists saw biblical characters, and how they saw alchemy as mentioned in the bible and coming from God. link
..and almost 80 other episodes, and much more in that first link. So maybe boil it down and ask some more specifics. I'm happy to come back.