My decanters are washed in hot water. The outside is then dried with a clean cloth, as is the top of the inside of the neck — typically one can’t reach further. The still-warm decanter is then left standing, without stopper, so that the hot ‘wet’ air can rise out of it. So far, so good.
For some decanters, the inside dries very fast, within a few minutes appearing to be crisply dry. For others, there is a mist of fine droplets on the inside surface that can take a week of dry weather to evaporate. It seems to be binary: some dry fast; some dry slowly; none in between.
Is there a known property of types of glass which makes the drying quick or slow? If yes, what is that property? Can that property be identified in a decanter before purchase, such as in a shop or online?
It might help to reject some hypotheses.
Glass thickness? There is a continuum of glass thicknesses. But I do not observe a continuum of behaviour: two speeds: very fast, and very slow.
Water temperature? All my decanters are washed in my almost ritualistic way, with hot water from the same kitchen tap. And, always, drying starts with the decanter very hot and consistently so. Yet the reliably-quick are reliably quick, and the reliably-slow are reliably slow. It is a property of the decanter. Indeed, this is so reliable that a few years ago I gave away all of my slow decanters (except one, much liked for its shape — but it is still slow). The speed is a reliably repeatable quality of the decanter.
Air humidity? No, for the same reason as water temperature.
Water hardness? No, for the same reason as water temperature. Speed is a reliably repeatable quality of the decanter.
