>Well, from Ivans' previous explanations on color shift, my best guess
would be
>that your particles are aggragating to larger sizes thus the change in
spectum
>absorbtion. (How'm I doin' Ivan?).

Very interesting! So its not just oxidation, its a degradation
of the suspension. 


>I suspect that 6 hour runs are a little on the long side. Try 1/2 of that
for a
>test. The other thing to try is a FRESH charge of water!
>                                                       

Right!  It always seems to come back to the water.

many thanx

Steve King


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