It's important to remember that the exact techniques and products used by their stylists are not publicly available. However, it's likely they used a combination of:
* Temporary hair color sprays: These can create bold colors for a short period and are easy to wash out.
* Semi-permanent hair dye: These dyes last longer than sprays but still fade over time. They can achieve bright colors and have less damage than permanent dyes.
* Permanent hair dye: These dyes create the most lasting color but also cause more damage to hair. They might have been used for base colors or to create specific shades.
The OMG Girlz's stylists likely had experience with creating vibrant hair colors, and they probably used a combination of techniques and products to achieve the looks they desired.