As a new member I think I am permitted to introduce myself and mention my business, Studio Graphics. I produce film negatives and positives, as well as many other services, for the graphic arts industry and have done so for about 33 years.
I do not have a web site at this time. I have always been busy from word of mouth over the years. I will also try to answer any technical questions members might have in this regard ie. film density, halftone screening, white underprints, white negative images on dark substrates, etc. I don't know everything but I am willing to share what I do know .