Sally is using Interference Acrylic colors that offer a unique "interference flip."
When viewed from different perspectives, Interference colors flip between a bright opalescent color and its complement. When applied over white or lighter surfaces, the Interference color is less obvious and the "flip" effect is more obvious. When applied over black or darker surfaces, the Interference color is more obvious and the "flip" effect is less obvious.
It is very interesting!
- Jan Francoeur
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