Quote Originally Posted by davido View Post
Thanks guys.
it works but the dmax seems a little inconsistent over the coated area.
Inconsistent dmax sounds similar to my contaminated VDB experience. I had sediment in sensitizer and filtered it then had the similar problem.
Loris pointed out that it might be contamination problem, and I tried the coffee filter he recommended (melitta brand).
Since than I filtered 2 VDB and 1 New Cyanotype sensitizers with that filter brand, and no problems.

It is likely to be a contamination problem, but I have no experience with argyrotype.