Hi,
First I contacted the neg onto an ortho 4x5 neg.
Next step I enlarged the contact onto a 8x10 ortho.
This one is than used.
My older ones where much to dark, I learned that how softer the neg is, the better the cyanotype works.
First I used a glass rod, but often there where parts where there was more emulsion than on other parts. I now used a brush and this works much better.