I know this is pretty insane but...

I know this is pretty insane but, is it possible to make your own B&W film? The KODAK PROFESSIONAL T-MAX 400 Film looks nice. I was just wondering since developer formulas are on the internet why arn't films?
Joe Moo

Ps. I am new here!

If I'm not mistaken this site has an entire forum dedicated (there was a url link here which no longer exists)