On 03/02/2012 04:36 PM, Le_Forgeron wrote:
> Le 02/03/2012 21:56, James Holsenback nous fit lire :
>>>>
>>>>     (I'm assuming human spit creates a protective "layer" that stops
>>>> fogging.)
>>>
>>> ISTR having tried that with limited success - but  it does make sense.
>>
>> certified diver (navy days) and it worked just fine for me ... matter of
>> fact that's what everyone else did as well
>
> Not a protective layer, just a wet liquid layer. Fog in goggle is opaque
> because it's a distributed noise of liquid points over a dry surface.
> Spitting will create a thick film that "glue" to the glass (work better
> on glass than on plastic) and that film collects the points of fog.
> Being dissolved in the thicker film, humidity does not become
> diffracting/white.
>
> Issue of spitting: goggle accumulate a lot of proteins which make the
> goggle more opaque. You need to use a bit of dish-washing product with
> clear water after usage to get ride of the proteins. (So, it's "spit
> before, wash with tension-active after"; Washing with only clear water
> is a failure)

well, salt water diving will rot your equipment, so yes washing with 
something like dish-washing soap is a definite must ... on "The Hawk" we 
used to just throw everything in this big tub and someone else did the 
"dirty work"

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