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More on the fog in mask stuff... I just experienced this again today (and remember it from the past). While doing some relatively simple mix dives to 225' I got the misty haze in the mask on many of the switches, from Mix to air, air to nitrox, and nitrox to O2. I should note that I use an Aga full face mask on all deep dives, while I don't believe Rich Pyle does (is that right?). His mask fogging in a regular mask would be more "unusual" than mine, but since the sinus/nose area is definately connected to the breathing path, an effect could be noticed. My 2 theory's are...When you mix gasses of different densities, you probably are causing a shift in pressure similar to an atmospheric pressure change on earth where a haze can develop in the sky. Dissolved liquids or moisture in the mask could be caused to make a "cloud", which it seems that this must be. So, just like with any diving, it is probably related to the pressure. My other theory is much more vague. Here ya go... If you are diving on a Friday, Saturday, or Sunday, between the times of noon and 3, you have a 90% greater chance of these "clouds" forming, as everybody knows that just as diving time (weekends) approaches, you are much more likely to get clouds, as no diving weekend is ever allowed to have perfect weather, and this effect is transfered to the interior chamber of your mask. :-) Well, anyway, that's all I can figure. One other note...my dives are between 40 and 70 degrees (we go from 70 to 55 degrees as we pass the 35' mark, and below 80-100 it's always about 40 degrees. This may have some amplification on the effect. Happy diving! Tim Olson
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