Half-Rainbow Hair Is the Hottest New Beauty Trend on Instagram

The rainbow hair trend keeps surprising us with its ability to evolve. First there was neon armpit hair, then there were vibrant eyebrows. Now, we think we've hit the peak of the colorful coif trend with half-and-half hair dye or split-dyed strands. It's exactly what it sounds like: part your 'do down the middle, then dye each side a different color for a look that's half Cruella de Vil, half anime, and 100 percent awesome. Read on for some inspiration, but before you commit to looking like a mermaid full time, read our pastel hair-dye tips!