Bleaching your hair too much

If you’re planning on dying your hair a bright blue, it’s best to be careful with bleaching. The intense color remover in some bleaching kits can cause damage if used too frequently.

To prevent this, use a lower-volume developer for your first few attempts at bleaching and don’t leave it on for longer than 20 minutes. For example, if you normally use 20 volume developer but want to try something more intense (such as 40 volume) for the first time, start off using half strength (10 or 15) first thing in the morning before work so that by the end of your shift you’ll have enough time to process it into whatever shade of blue you’re aiming for without being too late for evening plans! That way there’s no pressure about whether or not you’ll be able to finish up in time before going out this evening!

Not having enough hair to color

If you don’t have enough hair, don’t overdo it. If you have very thick or very curly hair, your color will be darker than what’s shown on the box.

You can add highlights to an existing blue dye job if that’s what you want, but if you’re trying to achieve a lighter shade altogether, use the same color but in a different shade of blue (like “ice” instead of “midnight”).

Getting an allergic reaction

When dying your hair blue, you might experience some side effects. These include:

• A rash or irritation of the skin
• A respiratory reaction (coughing, wheezing, difficulty breathing)
• Hives or swelling of the face and throat

If you’re concerned that you may be suffering from an allergic reaction to the dye, do a patch test before applying it to your entire head. To do this, dilute a small amount of dye with water and rub it onto a small area of skin for about 15 minutes; if there is no reaction within 24 hours, then proceed with full application. If there is any sort of reaction—such as redness or pain at the site—wash off immediately and call 911 or go to an emergency room immediately.

Leaving the dye on for too long

When dying your hair blue, it’s important to remember that leaving the dye on for too long will burn your scalp and cause an uneven bleaching effect. This means that you may not be able to achieve the color you want, or worse, damage your hair so much that it breaks off. If this happens, don’t worry! You can always go back to being blonde again by going through the same steps as before and rinsing until all of the dye is out of your hair.

Not being able to get the right shade of blue

Once you have the right ingredients, it’s time to mix them. The most common mistake that people make is using too much dye on their hair. While this may not be a problem for people with lighter hair, those with darker tresses should be careful not to overdo it.

Even if you follow all of our tips above and still don’t get the shade of blue that you want, don’t despair; there are ways around this! You can always add more dye or bleach your hair again until you achieve the desired color–but remember: if in doubt, always consult with a professional first!

Not being able to successfully remove the blue after it’s dyed

If you can’t remove the dye, there are a few things you can try. First, you should wash your hair with dish detergent and then apply color remover. Next, you could use lemon juice or baking soda in a paste form to rub on your scalp. Purple shampoo or clarifying shampoos are also effective ways of removing blue dye from your hair as well as vinegar and hydrogen peroxide. Last but not least, try using a clarifying shampoo followed by an olive oil treatment if nothing else has worked thus far!

The tips in this article will keep you from having a bad hair day!

• Bleaching your hair too much before applying the blue dye. If you bleach your hair, be sure not to overdo it! You want your natural color to come through, or else the blue won’t look as vibrant and beautiful.
• Not having enough hair to color. If you don’t have a lot of hair on your head, but still want some bright colors in there, consider using extensions or getting an undercut (a hairstyle where only the top layer of hair is dyed).
• Getting an allergic reaction. Some people are allergic to dyes—especially those who use them often—so if you’re susceptible, try out a test piece first before applying it all over your head!
• Leaving the dye on for too long. This can damage both your scalp and make it hard for us at Henna Me Crazy to get rid of any unwanted residue from previous dyes (which could lead us into another post entirely…) So don’t leave anything on longer than necessary!