Dark Field Glass

I have been doing some experimenting with glass lighting lately.  One technique for lighting glass is dark field.  With this technique the background is dark and the the glass edges are lit such that they appear white.   To use this technique, first set up a white background.   This background is then uniformly lit.  In front of the lit white background place a black or dark background (dark background is not lit).  The subject should be placed in front of the dark background, on a dark surface.    Place a large (relative to subject) white card or reflector on either side of the clear glass subject.  Now the  light bouncing off the white background should bend  around the dark background lighting the edges of the glass white.  The amount of white edge is controlled by moving the white reflector on each side of the subject closer or  farther from the subject.  Here is an example.

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