Hi again A,
Relating to your question on drying, I received a question from another customer, asking whether the round strangely colored artefacts in the middle of the membrane seen in the attached photo was due to insufficient drying.
I think that this customer is correct, that kind of artefact is most probably due to insufficient drying of the membrane before analysis. I talked to one of my co-workers about it, and she said that she always dries the plates upside down on top of the ventilation holes of the hood for 45 minutes. See attached photo.
She has never had any issue with dust particles interfering with the results. Different schools I guess, but please know that this is a good and effective way of drying the plates as well. (In an earlier version of my response I wrote that it would be enough to dry plates in this manner for 15 minutes, but after discussion with my co-workers I've now edited the post to say 45 minutes).