On an H colored H&A, there is a faint fluorescence: is the a positive or a negitive (I have read studied up, but I am still unsure.........thanks in advance,
"Faint fluorescence" is unlikely to have any affect on appearance at all save for a faint blueish (assuming faint blue fluorescence)
glow under a black light. Any unlikely affect on appearance should be positive, i.e. to make the stone face up a little "whiter". Hope that helps. I''m not an expert, but have just been lurking a few months.
Faint blue fluorescence will have neither positive or a negitive effects on your diamond. Like the man said, you will only see it under "black" lights in a dark room.