JT88, it sounds as though your ferric chloride solution is too strong. I would suggest a 1:20 solution of FeCl3 in water and see how that works for you. It may take several minutes to bring out a pattern but you should be less likely to go straight to rust. Warming the blade can accelerate the process when using milder solutions.
A lot of this is trial and error. Fortunately the blade can always be repolished and one can start over.
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