I don't think there's really a set ratio as different steels react in different times and ways with fecl .
I always start out with 20% fecl or less .
I always mix only with distilled water .
You can always boost the ratio from there .
Just keep the solution moving on the blade surface .
The only piece I have let stand in a solution was a contemporary Indian kanjar with a bird's eye damascus pattern , I was looking to make a topographical etch and it worked in about 30 minutes .
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