I made my first emulsion in a long while last nigth, using this formula, and I have a couple of questions:

1. when I diluted the AgNO3 with Ammonia, it turned brown, as I expected, and as I added more, it turned darker and darker until it cleared up, leaving a brown precipitate at the bottom. The precipitate looked suspiciously like silver. Is this normal, or do I need to get a different bottle of ammonia?

2. My hot plate is in capable of holding a temperature under 130 degrees F. what effect on crystal growth will this have?

3. even in a chilled ice bath, my noodle wash caused an increase in volume, about 10-15%, using about 8% gelatin. The resulting emulsion afterwards was not terribly stiff (Bloom 250 photo grade gelatin). Is there a temperature at which photo gelatin breaks down?

Thanks for the help.