Response to Using butane gas to preserve solutions?

Nitrogen will not work, as it lighter than air, and will simply diffuse out unless kept under a positive pressure from a nitrogen source. In the labs, we used to use argon to blanket a liquid, but this is impractical in a home darkroom. Tetenal makes a product called Protectan that is supposed to work well. See, http://www.jobo-usa.com/products/chembw.htm#Protectan Spray

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