Hi All

I was wondering if I could pick your brains and ask you a question about a persistent problem I'm having with my PT/PD printing?

I keep noticing a strange light speckling occurring every so often. In this example it's present to the left of the lamppost, pretty much in the center of the print...



I'm using Arches Platine paper, brush coated (hake) with a 7062 PT/PD mix. The developer is Potassium Oxalate (at room temp.) with Potassium Dichromate added for contrast control.

The paper doesn't appear to have been abraded during coating and I'm pretty sure it's not a chemical stain. Could it be a defect in the paper itself?

Any suggestions would be gratefully received!

Many thanks in advance,
Tom.