Ferric chloride seems to be the next best alternative to Nital but
1. it is more difficult to work with as it tends to stain everything... including the sink;
2. the end result shows less contrast than with Nital;
3. it leaves the piece more prone to rust.
As with regards to the etchant store, they used to deliver to individuals until a couple of years ago. I particularly liked their 5% Nital that allowed me to dilute it down to 4% which in my oppinion delivered the best results.
Polishing thr surface to anything above 2000 grit (3000 in some cases) might be counterprodictive as the metal becomes so mirror-shiny that makes it difficult for the etchant to bite.
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