That's what Promega says:

Opaque-walled 96- or 384-well tissue culture plates are available as white or black with solid bottoms and white or black with clear bottoms. The clear bottom plates offer the advantage of being able to examine the cells by microscopy during the course of the experiment. The primary difference between white and black plates is their reflective properties. White plates reflect light and will maximize light output signal; black plates absorb light and reduce background and crosstalk. For these reasons, white plates are commonly used for luminescent assays and black plates are used for fluorescent assays. When multiplexing a luminescent and fluorescent assay, the use of a white plate would support maximum light output signal for the luminescent portion of the assay, but result in higher crosstalk and background for fluorescence. The use of a black plate in a multiplex assay would reduce fluorescent signal crosstalk and background with a reduction in luminescence.

Yes. Mine did work

That's what Promega says:

Opaque-walled 96- or 384-well tissue culture plates are available as white or black with solid bottoms and white or black with clear bottoms. The clear bottom plates offer the advantage of being able to examine the cells by microscopy during the course of the experiment. The primary difference between white and black plates is their reflective properties. White plates reflect light and will maximize light output signal; black plates absorb light and reduce background and crosstalk. For these reasons, white plates are commonly used for luminescent assays and black plates are used for fluorescent assays. When multiplexing a luminescent and fluorescent assay, the use of a white plate would support maximum light output signal for the luminescent portion of the assay, but result in higher crosstalk and background for fluorescence. The use of a black plate in a multiplex assay would reduce fluorescent signal crosstalk and background with a reduction in luminescence.

Ok, I see that Mrs Konovalova gave you descripton from Promega.

To see what Corning says, please use that link (page 4):

http://www.level.com.tw/html/ezcatfiles/vipweb20/img/img/20297/productselectionguide_microplates11_02_cls_mp_014.pdf

I hope it will help you.