No, you do not need to bleach your hair before applying the glossy tint

Up to 20 washes, depending on hair care habits and washing frequency.

Apply from tips to roots, as roots process faster for consistent results. But if you are a beginner you can avoid applying to roots

Best results on virgin hair, results on treated hair (box dye, Henna, any other hair treatment) may vary

Yes you can mix hair tints, except Hazel Brown. Do a strand test first to check results.

To help maintain the color for longer, avoid washing your hair too frequently, and use sulfate-free shampoos. After two weeks, use the included anti-fade conditioner to keep the color fresh.