EP 190: Can You Use 40 Vol Peroxide on Scalp? A Hairdressers Guide.

Wondering if 40 vol peroxide is safe for on-scalp use?

In this episode of Colour Kristina Talks, we’re busting myths and breaking down exactly when, why, and how to use 40 vol peroxide safely for red and copper hair. If you’ve ever questioned whether 40 vol is too strong or risky, this episode will give you the answers you need.

We’ll cover these three key scenarios where 40 vol is a must-know technique:

✔️ 40 Vol + High-Lift Tint: The perfect solution for achieving peachy, golden, and strawberry blonde tones without bleach.
✔️ Lifting Dark Bases to Copper: How to safely lift levels 3 & 4 to a rich level 7 copper using 40 vol and high-lift tint.
✔️ 40 Vol with Permanent Colour: When and why some permanent colours allow 40 vol for maximum lift—and how to avoid over-processing.

From formulation tips to common mistakes to avoid (like never mixing 40 vol with bleach on the scalp!), this episode is a must-listen for hairdressers who want to master red and copper hair with confidence.

Listen to episode 190 of the Colour Kristina Talks Podcast for hairdressers, hair stylist, and salon owners to learn how to use 40 vol peroxide on the scalp.

Episode show notes here.

Follow the show host @colourkristina, and if you have questions or in-salon training requests, email us at [e-mail] or send a DM on Instagram.

The Colour Kristina Talks Podcast is hosted by Hair Colourist and Educator, Kristina Russell.

Click here to register now for the livestream class—CODE RED: Principles of Red & Copper Hair Colouring.