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Looking for food-grade humectant that deliquesces at RH >40%

Question asked by Rob McGuire on Jul 17, 2020

Is there a food-grade humectant that deliquesces at a relative humidity as low as 40%?

 

I would like to generate CO2 in an enclosed container (a quart or gallon) with Sodium Bicarbonate powder, Citric or Ascorbic Acid powder, and a humectant powder that will deliquesce if the RH is >40% to generate the water source.  I believe Sodium Chloride does the trick and is available in a food-grade, but I am hoping to find something less caustic. 

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