Thanks Loris, yes they are probably a little thin for cyanotypes, I generally do platinum/palladium prints, and the negatives should be fine.

The film was Ilford FP4+, tray processed in Pyrocat HD 2:2:100 dilution for 14 minutes @20C. I would probably go with 16 minutes, next time I am thinking of cyanotypes, or salt prints, but they then get a little thick for palladium.