Pink - that's pretty. I think that means there's manganese (pink at first, but it should turn brown on standing) or cobalt (was it blue for a little and then turned pink?).

The silver nitrate I bought from Salt Lake Metals was water clear with dissolved in water, and it turned a very, very pale blue when complexed with ammonium hydroxide. Probably a bit of copper... which PE will tell us is a no-no... ACS and AR grade are allowed 2 ppm copper in silver nitrate.

I suspect there was a bit more in the SLM silver nitrate I had, but I' guessing it was not much, as it was only blue with hydroxide and I only noticed the color when I poured it into a container so that it was more than a couple inches deep.