turquoise opal glass and silver foil I die cut a piece of silver foil with a paper crafting die and sandwiched it between turquoise opal and icicle clear (system 96) glass.  4.5" x 4.5" dish The silver becomes irridescent in color when chemically reacting with the blue glass.
[null, {"document_url": "https://www.delphiglass.com/gallery/store_viewItem?gid=73090", "unformatted_src": "https://www.delphiglass.com/agf_entries/7/agf73090_1.jpg", "src": "https://www.delphiglass.com/agf_entries/7/agf73090_1.jpg", "formatted_filename": "agf"}, null]