Most silver precipitates are milky - like the milky stuff you see when you wask the print. That's the surplus silver reacting with trace impurities in the tap water! The first times I tried this, I couldn't see any cloudiness at all. Then the waterworls put another source on line, upped the chlorine slightly, and hey presto! Cloudiness...

The best way to see if it works is to try it. I mixed my first (and so far, only) mix with "brown" ammonium ferricitrate, but it still works. I've "tweaked" it a little since then (added more water, mostly, and a few drops of AGNO3 solution and a smigeon of hydrogen peroxide), but I'm certainly not going to throw it away.

There's lots of silver in the solution, and it takes incredibly little to form visible precipitate. Try it, then start worrying if it doesn't work.