I have a conclusion. My group agreed that we should not use the glittery fabric for masks. They had placed a bulk fabric order for masks and got so busy distributing the fabric to the sewists that they didn't even notice the fabric shop had included a glittery piece. They are sending me a new batch of fabric. We are not using the other non glittery fabrics that got contaminated either. It's too risky.
My sacrificial laundry came out glitter free too so all is well!!
Thanks for all the advice.