Shouldn't have any effect. Stouts and Porters have the same refractive
index as lagers and wheat beers. The "skin" that the light goes through
is very thin and the most important time to be using one is when you are
trying to determine to continue collecting to kettle or divert to the
drain.
R
>> "Gregory Walsh"
<popcorn(a)ties2.net> 02/10/03 05:54PM >>>
It would also be very
interesting to come up with a methodology to
determine the effect of dark wert on refractometers.
Greg