When I got my first enlarger all my prints came out black and after re-reading all my books I still couldn't figure what was wrong! The room was light-tight, the developer the right temperature, the MG filters OK... That was when I learned about stopping down the enlarger lens!

Then there was the time I opened a box of paper with the room lights still on! Luckily I clued in before I got to the black bag which saved my butt.

- Justin