Lallan, in my case it is not science, it is more like rumors. I had read in the B&S web site that too much sensitizer caused mottling and it was a problem I was having, so I tried reducing the amount of sensitize and it worked for me.
Originally Posted by lallan
Joe above has a good explanation for not using too much sensitizer, I do see that metallic "sheen" sometimes when the print is dry. I did not know it was because of too much FO, learn something new everyday!
In any case, dont be afraid to take off 2 or 3 drops of FO, more than that I would not try. Besides, FO is cheap compared to pt or pd.....so back off only to improve your print, not to save on it.
Hope this helps.