Your search "developed" resulted in 2 Articles
You may have treasure in your attic. The kind of treasure that I am talking about can be exposed, processed, and developed. Finding old film is a great experience.
I've started developing my own black & white film lately and am still getting the hang of loading it onto the reels correctly. The first few rolls were disastrous but I've gotten better since and have even gotten some cool effects from my mistakes.