PX just means experimental. FX is "film experiment" PX is "paper experiment". The 3001 just means that was the next number available from corporate for test projects. It is a more recent number. Open the box (in total dark, no safelights) and see if there is a stuffer sheet inside. It will tell you how to process the paper and hopefully how to expose it. I don't remember if 3001 was one of mine or not. Dave ----- Original Message ----- From: j.t.whaler To: pure-silver@xxxxxxxxxxxxx Sent: Monday, March 24, 2008 4:10 PM Subject: [pure-silver] Re: Kodak Special PX 3001paper I have just been given a box of Kodak Special PX 3001 printing paper, is there any thing "special" in the box and is there any thing I should know before using? Regards John Lincoln, UK