Cotton Bring a fantastical color-change transformation to playtime with Barbie Dreamtopia Rainbow Magic Mermaid doll! Barbie mermaid doll features a neon-bright fantasy look with a tiara in her rainbow hair, a multi-colored tail and a bodice with sea-inspired accents. Dip Barbie doll in warm water to see her hair, bodice and tail instantly transform to reveal a rainbow of pretty pastels! Dip her in ice-cold water to see her change back to her original neon-bright look and relive the transformation again and again. Fairytale lovers will have so much fun transforming Barbie doll's look and taking her on enchanted undersea adventures!