Quote Originally Posted by sanking

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I only skimmed the article at unblinkingeye and your explanation didnt jump out at me. I do vaguely recall the part about toning. I'll certainly reread it thoroughly if I decide to go that route.

Thanks for the info about Na2. I was going to ask if there wasnt another possible chemical contrast control method, but I figured that I would have encountered it in my reading. I will certainly check into that!