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Choose Classic dye for color that lasts 4-6 weeks. Select Amplified dye if you want your color to last up to 8 weeks. Protect your work surfaces to prevent stains. Bleach your hair Wash and dry your hair Spread petroleum jelly along your hairline to avoid staining your skin. Do a strand test
This is Manic Panic's regular semi permanent dye. If you're testing out a new color, this is a great option as it only lasts up to 6 weeks.  If you’re thinking about bleaching your hair so the color shows up better, purchase their bleach kit as well. Choose a Classic dye from your local beauty store or online. The Amplified hair dyes have 30% more pigment than the regular Classic dyes, making the color last longer. Choose an Amplified color from Manic Panic's website that you think would look great on your hair. Prepare to bleach your hair before using the Amplified dye if you want your color to show up super well. Place newspaper or plastic bags over the surface where you'll be working. Put down multiple layers for extra protection, and stay away from any carpeting or furniture that you don't want stained.  The bathroom or kitchen is a good place to dye your hair. Plastic trash bags work well to protect any surfaces. to get the best results. If you have darker hair or want a super vibrant color, it’s best to bleach your hair using the Manic Panic Flash Lightning bleach kit. Read the instructions that come with the kit, mixing the bleach powder with the developer thoroughly before applying the bleach to your hair evenly.  The kit comes with plastic gloves, bleach powder, developer, a plastic container for mixing, a tint brush, and a plastic cap. How long to leave the bleach in will depend on the natural color of your hair, so check it every ten minutes to see how light your hair has gotten. Wash your hair several times using shampoo if you bleach it to make sure all of the bleach is out of your hair. Bleaching your hair beforehand is especially important if you're dyeing it a pastel shade. thoroughly before dyeing it. Use a regular or clarifying shampoo to wash your hair, making sure it’s super clean and rinsed out. Let your hair air dry or use a blow dryer to dry your hair thoroughly before starting the dye process. Don’t use conditioner on your hair beforehand, as this will prevent the dye from adhering to your hair correctly. Apply it to your hairline using your fingers, spreading it around your ears and neck to prevent the dye from leaving color on your skin. Keep the petroleum jelly off of your hair or else the dye won’t absorb properly. Once you’re completely done with the dye process, the petroleum jelly will wash right off. to see how the color will affect your hair. Testing one small section of your hair with the dye will help you get an accurate idea of how your hair will look. Pick out a small section of your hair that’s hidden from view and apply the dye to it. Let it sit for 30 minutes, and then rinse it out with cold water. Dry your hair thoroughly to see what color the dye makes your hair.  The test section only needs to be about 0.5–1 in (1.3–2.5 cm) in width. While it’s not required that you do a test strip, it’s a good way to know for sure how the dye will affect your hair before applying it to your whole head. Do a patch test using the hair dye by spreading a dot of it on your skin to make sure you're not allergic to it.