Grab a copper-based opaque, i.e. turquoise, sky-blue (NOT periwinkle), petroleum green - anything that reactions with ivory. Decorate it with some intense black, frit, trails, etc. Reduce it, or use a slightly reducing flame for the entire bead. Make sure that you get the red popping up on the turquoise or green. This bead is Petroleum Green and Turquoise, plus intense black frit. The reaction happened by itself - I must have been working in a reduction flame.