I do not doubt for one moment that you are correct Jean, but I think I might have done something like 300 to 600 keris and other small blades during the last 10 years or so, and all I've ever used is open plastic troughs.
I have of course done more blades than the numbers I quote, however I cannot remember exactly when I started to use vinegar rather than pine juice, but it was certainly more than ten years ago.
Maybe the volatility of the acetic acid is the reason why the vinegar will never damage a blade, no matter how long the blade is left in it:- the acidity of the fluid decreases over time.
In any case, the advice I have given is exactly what I've been doing for years, and it works. For me, it always works perfectly.
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