I'm playing with a pinhole camera recently.¹ It's the first time I'm actually developing photos myself.
On my developer bottle it says I should use 1 unit of it and mix it with 9 units of water. Also, I've read online that I should keep the paper in the developer tray for at least 1 minute.
But when I actually put exposed paper into a tray with this developer, after like 3-5 seconds (usually), it starts to darken really fast. So fast I need to remove it from the tray ~2-3 seconds later.
Now, I've read in some old photography book, that the brightness of the photo depends on the exposure time, and contrast of the photo depends on the developing time (time spent in the developer tray).
Is that statement correct? If so, would that mean that if I'd put paper in developer for like 10 minutes, I wouldn't get black paper, just an extremely contrasty image?
The image contrast is changing so fast, I'm having trouble removing it from the tray on time. I tried to mix developer with water in 1+13 proportion, to make it weaker, but it's still too fast. How do I control the contrast of the resulting image? Should I try even weaker mixture, or it doesn't matter? Or maybe I'm just taking overexposed photographs?
One sample photo — exposed for around 60 seconds, on a cloudy day at 4 PM. I kept it in a developer solution for around 15 seconds at most:
(1) - I built it from the shoe box where on one end there's a small hole, and on the other paper (which I glue for the time of taking a picture, and then unglue when developing)