Lightening 101: What you should know before you bleach

Before you dive into your next (or first!) Good Dye Young shade, there’s one step you can’t skip: lightening. Not sure where to start? This GDY guide will help you get started so you can create the perfect canvas and get the best results from your semi-permanent application.

Let’s start by talking about different kinds of dye!

Permanent dye works by penetrating deep into your hair’s cortex, permanently altering the color and structure with hydrogen peroxide (aka developer). Semi-permanent dye, on the other hand, acts more like a stain. It sits mostly on the outer layer of your hair’s cuticle, slightly penetrating the shaft without changing your hair chemistry.

Bleach not only removes natural pigment to create that light canvas, but it also opens the cuticle so semi-permanent color can grip the hair and last longer. While vivid shades can show up on unbleached or white/silver hair depending on tone, they won’t be as bright or as long-lasting because the cuticle isn’t as open.

Think of a semi-permanent vivid color like a marker on paper: the lighter the paper, the brighter the marker will look. The closer your hair is to a pale blonde (levels 9–10), the more vibrant your final result will be. Some shades, like our Darker Daze collection, can be applied to hair that has been lightened to a level 6-8. We recommend this for our naturally dark haired DIY-ers so you don’t push your hair past its porosity limits! Remember to pre-tone after lightening if a cool shade is your end result.

Understanding Bleach & Developer

Lightener has two components: powder lightener (bleach) and developer.

The developer opens the hair cuticle and activates the lightener.
Developers typically range from 5 to 40 volume.

The Good Dye Young Lightening Kit includes a dust-free powder lightener and a 25 volume cream developer. This strength provides a strong lift while helping maintain hair integrity.

It may be tempting to use 40 volume for faster results, but higher volumes open the cuticle more aggressively and significantly increase the risk of breakage and irreversible damage, especially when lightening at home. Never use 40 volume on the scalp. If you need more lift, it’s much safer to lighten in multiple sessions with a moderate developer.

How to Use the Good Dye Young Lightening Kit

For most of our shades, the goal is to create a level 9–10 light blonde base so your GDY semi-permanent shade shows up as vibrantly as possible. For shades in our Darker Daze collection, and other darker shades, lightening your hair to a level 6-8 may be enough.

1. Test First

Do a strand test to check how your hair responds.
If applying to the scalp, perform a patch test on your skin.

2. Section the Hair

Divide hair into four sections:

Part down the middle.
Part from crown to ear (side to side).
Clip each section securely.

3. Apply to Mids & Ends First

Start in the back bottom sections.
Apply lightener in ½-inch sections, fully saturating each strand.
Stay about 1 inch away from the roots.

Pro Tip: Heat from your scalp makes lightener process faster, which can cause “hot roots” (roots lighter than the rest). Apply to roots later for even lift.

If your ends are already light or previously processed, only apply to roots, and do your best to avoid overlapping the lightener on those previously lightened sections.