Hi, I just tried this formula in a smaller scale (20x less) and I added almot 8ml of Ammonia (22%), wich gives me a brownish/dark solution is that usual or is there something wrong with the ammonia I m using ?
It became clearer, but not clear, so I decide to stop adding ammonia.
Once the solution had been added to salted A solution, the precipitate was white as usual.

Now it's in the oven a 50C in a water-thing (bain-marie), for the next 30 minutes.

Hopes this will work , it's my first type adding ammonia and using your formula, usually, everything worked fine but was verrrrrry slow (1/4 iso at best) .