Hi, thanks for the replies.

I'm using new chemicals but I've used them for about ten prints over the weekends and I'm wondering if that makes too much exposure to the air for the developer. I was doing one print at a time (as that's what I can do in the cam) and then doing another a couple of hours later, and initially not putting the chemicals back in bottles first.

The paper is ilford multigrade III RC deluxe, sounds great but it was a gift and i've no idea whether that's the ideal. I do know the shiny surface is giving a few light reflections which are welcome. I don't have an enlarger yet.

Yes I've jsut started making my own, a cylindrical cam initially (bit of a hack job but works a treat) and I want to do multiple pinholes next.