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I wish there was a directory of sites like these.

Marginalia returns sites like these: https://search.marginalia.nu/

Copper sulfate crystals grow huge. I'm fairly certain this was included in one of those DIY kits that took weeks / months to grow.

Just a footnote. Remember that copper sulfate are highly poisonous to molluscs, fishes and crustaceans, and could kill pets also, so if you have it, store the stuff and saturated solutions in a safe place and -don't- discard it in the sink.

Can you imagine that guy's place, with crystals growing everywhere?

!

I know what I’m doing this weekend with my crystal-obsessed daughter and the bag of copper sulfate I forgot on top of the fridge.

I think the best part is not the recipe itself, but the error handling of the article. It goes into detail into what conditions are optimal, what kind of tools to use, how various mistakes look like (with photos!).