Pyro - Ilford Blue/Green Lights My enlarger is Ilford 500 with 300watt Blue and Green lights in head (not magenta/yellow). I use Ilford FP4+ and TriX 320 in medium format and 4x5 film sizes, Ilford variable contrast paper RC (& will soon be using) Fibre. I recently purchased pyro PMK neg developer with Gordon Hutchings Book of Pyro, his formula produces yellow/green stain. it sounds to me on my first reading that Hutchings recommends the traditional magenta/yellow lights..... If you have used pyro pmk or any other pyro with a blue/green light head, what is your experience? thanks.