Gregory L. Hansen wrote:
The local one-hour photo labs have very little ability to do special
requests like pushing film. And surely for good reason. But what would
happen if they just ran it through the developer machine twice? As I
recall, at some point it goes through a fixer bath that, well, fixes it,
and maybe it can't be developer further at all after that. But my
knowledge of the chemistry is really pretty sketchy.


You don't need a dark room to develope film or slides. Just the
chemistry, the tanks, and a changing bag or a dark closet. A book on the
process helps a lot too. You will need some tools as well such as a
thermometer, measuring cups and special containers but they are minor in
cost.