Cigar "Bloom or Plume"
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What bloom or plume signifies is the proper RH or Relative Humidity has been achieved. If your cigars have this light grey mist on them, use a soft cloth to wipe away mist, and enjoy.
If however, you see mold which is greenish-blue in color and gives off a musty odor, those cigars should be destroyed, the humidor left open, and a solution of 50% alcohol and 50% water used to wipe the interior. Take a swab and wipe all corners. Let the humidor remain open for a day before re-stocking.
Again, cigar bloom or plume is a good sign that the humidor's gauges are working.
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By Al Remp, product specialist and trainer, Thompson Cigar.