Thanks, Athiril and Hologram! Much appreciated.
Yes, I have been looking at hologram emulsion making. I actually tried the diffusion method per Jeff Blyth, as well as an 'improved version' of that method, but I was unable to produce a presentable image. Getting a bit disillusioned, I decided to turn to wet collodion. After all this was the method used by the founding father of microphotography (John Benjamin Dancer). At this point I am practising the technique; not yet on a microscopic scale but that is soon to follow because my first attempts are beyond expectation.
But at some point I will want to try gelatin emulsions again. I guess I'm a bit too stubborn to just give up...
Hologram, I will be sending you a private message.