Experience electrifying neon yellow hair with Crazy Color Semi Permanent Hair Dye in Caution UV. Perfect for all hair types, this vibrant shade glows brilliantly under UV light, making it ideal for parties, festivals, and daring everyday looks. Make a bold statement with Crazy Color Semi Permanent Hair Dye in Caution UV. This vibrant neon yellow shade is perfect for all hair types and glows brilliantly under UV light, making it the ideal choice for parties, festivals, and daring everyday looks. With long-lasting color that stands out from the rest, you'll love the vibrant and electrifying transformation this dye brings to your hair.