Hello everyone.
I'm currently on holiday and just started developing some of the pictures I took. However, when I took the first roll out of my Paterson tank I was surprised to see that my negatives were very dark - or at least far darker than I'm used to. There were also some dark marks along the edges of the film, mainly at the start of the roll. After the negatives dried, I took a picture of each frame on a white screen with a digital camera+50mm lens to get a closer look at them. This was admittedly quite a poor scanning setup but it was enough for me to invert the negatives in photoshop and see that they are very dull and bright. Here's some information about my developing setup in case it helps.
Since I'm abroad I couldn't buy my chemicals from where I usually buy them, so I purchased them on a site that is similar to eBay. I bought a litre of Ilford ID 11, which I mixed into its stock form and then diluted 1+1 to develop my film. I mixed a litre of Ilford's stop bath as well, which I used in its stock form. As for the fix, I accidently mixed it at the wrong dilution thinking it was the stop. I added 50ml of fixer concentrate to 950ml of water, and a little while later, when I realised my mistake, added 200ml more of the concentrate and 50ml of water.
I then developed my film (HP5+) in the working solution of the developer at around 20-22C for 13 minutes, stopped the development at around 22C for 30 seconds, and then fixed the film for 5 minutes at around 22C. I washed the film in 18-24C running tap water for 30 minutes, and then did a final wash in demineralised water for a another few minutes.
As for my metering, I used the built in meter of my Minolta SRT101 to meter all of the pictures. I compared it to a small shoe mount light meter and my digital camera's light meter and they all seemed to be within one or two stops of each other. It particularly complicated scenes they could differ by as much as three stops though.
I should also mention that the film went through two different X-Rays on the way here if that makes a difference.
I've attached some images below of the negatives and the scans of the negatives. If anyone can provide some insight into what went wrong I would really appreciate it.