Rockabilly® Blue Semi-Permanent Hair Color – Amplified™ European Formula

Rockabilly Blue is one of our strongest true, neutral blue hair dyes. This vibrant, ultra-powerful blue leaves cool tones on virgin, unbleached hair. For head turning results, we recommend lightening hair to a light level 9 blonde and toning hair before use to prevent unwanted hues. For best results, we recommend pre-lightening your hair using a Manic Panic Flash Lightning® Hair Bleach Kit. Always follow the instructions included with each product. Always perform a patch test 24 hours before use, as instructed on the packaging. details { border: 1px solid #000; border-radius: 6px; margin: 1em 0; padding: 0.75em; font-size: 16px; background-color: #fff; } summary { font-weight: 600; font-size: 16px; cursor: pointer; list-style: none; } summary::before { content: "➕ "; font-weight: bold; } details[open] summary::before { content: "➖ "; } details[open] { background-color: #f9f9f9; } details > *:not(summary) { margin-top: 0.75em; font-size: 15px; line-height: 1.5;