This is a professional-grade raw developer meant to be mixed with a separate permanent hair color or lightener rather than used alone. At 10 volume it's the mildest option in the Hi-Test range, so it's chosen for gentle services — blending gray, refreshing faded color, or tone-on-tone color — on hair that doesn't need significant lightening. It suits salon professionals and experienced at-home colorists who already know how to mix and time a developer; it isn't a beginner-friendly, ready-to-use consumer product on its own.

Reach for the 10 volume when the goal is subtlety rather than lift — blending in gray, refreshing tone between color services, or lightening only slightly — since its lower oxygen release is gentler on hair than the 20, 30, or 40 volume versions in the same line. It still uses Hi-Test's thick, stabilized cream base, so it behaves the same way at the mixing bowl and on the hair as the stronger volumes, just with less lightening power.

Mix with the chosen permanent hair color (or lightener) at the ratio specified by that color product, not a fixed universal ratio, since ratios vary by brand and line. Perform a patch test at least 48 hours before use. Apply evenly to hair with gloves and a cape to protect skin and clothing, and process for the time specified by the color manufacturer rather than by the developer alone. Rinse thoroughly once processing is complete. Close the cap immediately after each use and store away from direct sunlight to preserve the developer's strength.

Pros:

• Mildest volume in the Hi-Test lineup, so lower risk of dryness or breakage than higher-volume developers
• Thick, stabilized cream consistency stays put during application instead of running
• Good for gray blending and tone deposit without changing hair structure much

Cons:

• Limited lift (up to about two levels), so it won't work for significant lightening or bleaching services
• Must be purchased and mixed with a separate hair color product — it does nothing applied alone
• Like any peroxide developer, requires a patch test and careful timing to avoid irritation or over-processing