Iridescent Medium (Winsor & Newton) is an paint additive with the consistancy of nail polish varnish. You can either paint it over your existing art (which I did here) or mix it directely with your watercolor paint. It dries transparent but the medium has highly reflective silver sparkles or flakes suspended within it. When the paint and medium dry, your art is left with a very subtle sparkle quality (almost like mirco glitter). The scan can barely show it but if you move the ATC you can see the
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