A long answer with good information is much better than a short answer that does not answer the question.
What you say is more or less what I suspected. Much of the proprietary information is in the tradition of the practice and subject to loss with the persons of the practice.
Also, based on conversations I have had with you and other people involved in emulsion making, and in my own limited work with coatings, there appers to be quite a lot of art that is needed to go along with the science of the practice.
Originally Posted by Photo Engineer