The purpose of my exercise was to find a way of getting even coating of 20
x 24 pt/pd prints that would give a good d max and good separation in the
highlights and the shadows and subtle gradation overall..
We were trying different coating methods and different papers until we
found a combination that worked.
We found one. A lightly humidified ! % deionised ossein size.
We had achieved our objective, so we stopped looking.
This in no way is a reflection on the usefulness of research into
surfactants and their effects.
To answer your question we tried a number of commercial photographic
wetting agents, none of which seem to achieve our objective, so we took a
different route.
Terry
PS I have copied this to the list as it answers questios from others
NB I must buy some Tween 20