Humidor Construction
• Spanish cedar in Humidors
• Veneer or solid wood
• Air-tight seal of humidor
• Glass- or wooden lid humidors
• Quality criteria of humidors

Humidifier
• Optimum humidity level
• Sponge- or acrly polymer humidifier
• The correct liquid 
• Refilling - how often

Hygrometer
• Digital vs. analog
• Accuracy

Humidity is too high

If the humidity in the humidor is too high, one might do the following:

• Ensure that the hygrometer was calibrated according to the salt solution method, that the humidifier was filled with a propylene glycol solution (when using sponge-based humidifiers) and that the inside of the humidor was sufficiently moistened before its first use.
• Only for sponge-based humidifiers: If the propylene glycol solution has not been refilled for a few months then it might be time to refill the humidifier with the propylene glycol solution.

Deviations of a few percentages from the 70% mark should not be of major concern and one should also consider the explanations regarding the accuracy of humidity measurement (See hygrometer accuracy).

 continue "humidor is bleeding / resin"