http://sam.zeloof.xyz/first-ic/
At the very primitive end of the technology, integrated circuits can be made in the home workshop.
Easier if you're not in a big hurry; then you can use dilute solutions. E.g., concentrated hydroflouric acid catalyzes dissolving flesh. But you can buy it in 1% solution at the hardware store.
http://sam.zeloof.xyz/first-ic/
At the very primitive end of the technology, integrated circuits can be made in the home workshop.