I spent 3 days last weekend in the darkroom making Ilfochrome prints. Some came out well, others not so well. I was printing a mix of transparencies in 6x9 and 4x5 formats, mainly velvia, but a few Ektachromes aswell. In accordance with other posts here, I made contrast masks on FP4 and then sandwitched the mask to the tranny for printing. I was using the gloss RC medium contrast paper run through a Cap 40 processor. The main problem was that the colours were muted, and the whites were grey and muddy on some of the prints. I'm presuming that this is from the masking film having a grey base, and when I printed an unmasked tranny I was able to get a clean white. I was able to produce a beautiful contact print from an 8x10 Velvia, unmasked. I was really surprised at how slow the paper is, most trannys were in the 6-10 min exposure ranges at F8. I'm using an Omega D5 and was printing to 16x20. I assume that this is from the layers of the original tranny plus the maskign film adding a bunch of density? Any tips to get a nice clean white and control contrast at the same time?