When you’re searching for the perfect hair color to cover gray, durability and hair health matter equally. Permanent hair dyes, also known as oxidative dyes, penetrate the cortex to deliver lasting pigment and full gray coverage (Salerm). We tested leading professional lines and zeroed in on Keyra Colors and Blust On PRO. Below you’ll find a side-by-side comparison of their coverage, processing time, formula, and aftercare so you can choose with confidence.
Compare Hair Colors
| Feature | Keyra Colors | Blust On PRO |
|---|---|---|
| Coverage & Lift | 100 % gray coverage, up to 4-tone lift (Keyra Colors) | 100 % gray coverage with Fast Action option |
| Processing Time | Standard 30–40 minutes | Rapid 10-minute processing (Blust On) |
| Formula & Ingredients | Keratin and natural components for shine, smoothness, and conditioning (Keyra Colors) | Hydrolyzed keratin, argan oil, provitamin B5; pH-balanced (Blust On) |
| Aftercare & Maintenance | pH Acid Shampoo, immediate action mask, and conditioner (Keyra Colors) | Ammonia-free bleaching powders plus salon-grade conditioners |
Keyra Colors Overview
Keyra Colors blends active keratin with botanical extracts to protect your hair fiber and scalp while depositing vivid, lasting pigment. You’ll get 100 % gray coverage plus lift up to four tones using their super lighteners. The balanced pH system minimises damage and seal cuticle scales for extra shine.
- 100 % Gray Coverage & Up to 4-Tone Lift
- Keratin-Based Formula for Strength and Smoothness
- Complete Care Ritual: pH Acid Shampoo, Nourishing Mask, Frizz-Reducing Conditioner
Every bottle’s formula is designed to condition as it colours. When you follow up with the matching pH Acid Shampoo and mask, you’ll neutralize residues and lock in moisture. If you prioritise hair health alongside flawless coverage, Keyra Colors has you covered.
Blust On PRO Overview
Blust On PRO caters to busy stylists and DIYers who need salon-quality results in record time. The Fast Action hair color processes in just 10 minutes, reducing chair time by 70 % without compromising vibrancy. Its pH-balanced base and blend of hydrolyzed keratin, argan oil, and provitamin B5 strengthen the cortex and smooth each strand.
- Rapid 10-Minute Full Coverage (Blust On)
- Developer Range from 10 to 40 volume, including a 27 volume option for Fast Action
- Ammonia-Free Bleaching Powders for Controlled Lift up to 7–9 Tones
- pH-Balanced Formula to Maintain Hair Integrity
If you need a professional-grade system that works on a tight schedule, Blust On PRO delivers consistent gray coverage and vibrant hues, all backed by a versatile developer line.
Choose Your Best Option-What hair color is best for covering gray?
In deciding between these two top permanent hair color systems, think about your priorities:
- Pick Keyra Colors If You Value Hair Health
You’ll enjoy a keratin-rich formula plus a dedicated aftercare line that keeps strands smooth, hydrated, and strong. - Opt for Blust On PRO If You Need Speed and Flexibility
Fast Action processing saves you time, while a broad developer range and ammonia-free bleaches let you customize lifts and tones.
Both brands deliver full gray coverage and long-lasting results. Before you make a decision, explore more of our hair color resources to ensure you get the shade, lift, and care routine that fits your lifestyle.


