what is the best ferric chloride constration?
If you can get some for free, that is the best constration.
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I don't think that the winner has been announced yet. L
370g/l @ 20°C Well, that might not be the best one for what you want to do, but as you don't give the slightest clue, what 'best' means for you, one concentration is as good as any other. And by good, I mean useless.
Best in what way? Cheapest? Safest? Environmentally friendly? Most reactive? Most easily available?fyi: the word is "concentration". That should make google more productive.