Hello all, There are ways of making emulsions used in other non-photographic industries that bear very close resemblance in their manufacture to the emulsions we talk about here. If an emulsion can be defined as being somewhere between a solution and a fine suspension, what else fits the bill? Pharmaceuticals? Paint, maybe? Polishes? Could some of the more important physical fabrication processes that are 'obscured' in photo emulsion patents be easily discovered by looking at patents in other non-photo related industries? Further, what if we are putting too much stock in certain photo patents without having first hand knowledge to fill in the blanks? Then, for all practical intents and purposes, you would be wasting your time unless you knew what they didn't put in the patent to begin with. To put it another way; who would you rather trust with a delicate heart operation? Someone who just read about it, and says "yeah, I've done it", but can't prove it, or someone who had been doing the operation for 30 years? How many 30 year professionals do we have in the audience? Show of hands, please? Bob M.