I'm trying to shoot a photo of a textile with iridescent glitter glued onto it, but I can't get enough sparkle from the glitter. Basically a whole strip of glitter appears clear with a few sparkles here and there, barely noticeable.
I have a grey background which I need to keep consistent (lit with two side lamps), inside of a lightbox; two lamps on the side, one in the front (all diffused). I also must keep the same angle I am shooting at, and can't go below f/8. I have tried flashes, mirrors, LED lights around, long exposure, and moving the light. Is this impossible with all the restrictions I have?