Hoyu
Hoyu Cielo 1-Day Cover Gray Hair Color Comb
A quick-fix hair remedy formulated with camellia seed extract. The fast-drying temporary hair dye spreads evenly and quickly to reveal a natural color and smooth strands. The comb-shaped applicator makes it easy to touch up gray roots. Available in Natural Black and Natural Brown.
Paraben-free
Silicone-free
Natural
Color Fading
All Hair Types
As Needed
Optimized for Your Environment & Lifestyle
Nykaa
In stock
Recommended
Hoyu Cielo 1-Day Cover Gray Hair Color Comb
Hoyu
hoyu-cielo-1-day-cover-gray-hair-color-comb
Temporary Hair Color
10407590592805
Morning or Evening?
How often will you use this product?
Notes
Secure payment protection
Your Biodata Compatibility Analysis
Based on your 6 hair health indices and environmental factors
Poor Match
Significant incompatibilities
Growth Cycle Health Index
Hair Match
Hair Health Index Alignment
Optimal for OSI, SSI, DI, HSI
Ingredient Efficacy
Matching Ingredient Score
Environment Compatibility
Current UV, Air Quality & Humidity
Why This Works for Your Specific Profile
Damage Index:
Very healthy or severely damaged hair falls outside optimal treatment parameters
Water Quality:
Hair:
Closed cuticles resist product penetration causing surface buildup without internal benefits
Active Lifestyle:
High activity and frequent washing rapidly strip product benefits requiring excessive reapplication
Your Hair Profile Integration
Your Hair Archetype
Density Level
Washing Frequency
Shedding Level
Oil Level
Your Hair Health Indices
Oil Secretion (OSI)
Very low oil production
Scalp Sensitivity (SSI)
Very low sensitivity
Growth Rate (CMR)
Poor metabolism rate
Damage Index (DI)
Minimal damage
Hair Strength (HSI)
Very weak strength
Softness Index (SI)
Significant improvement needed
Water & Environmental Integration
Water:
Expected Results & Timeline
Key Highlights
What is it?
Temporary hair color with camellia seed extract
Who Is It For
Adults
Budget
$10.00 - $20.00
Timeline
Immediate
Why Youโll Love It
What Does It Help With?
Covering gray roots
Best for
Color Fading
Features
Fast-drying, natural finish, comb-shaped applicator, paraben-free, silicone-free
Checks
Paraben-free, Silicone-free
Ingredients Overview
Ingredients List
ethanol, water, polycarbonate-diacetyl-methacrylate-and-diacetyl-alkyl-methacrylate, lactic-acid, horse-chestnut-seed-extract, carbon-black, red-227, orange-205, purple-401, black-401
Key Ingredients
camellia-seed-extract
Ingredients Details
Ethanol
Common Name(s): Ethanol,cosmetic active,functional ingredient
CAS Number: N/a
DESCRIPTION
What It Does: Delivers characteristic cosmetic function at recommended use concentration.
Why It's Used: Selected for functional contribution and formulation compatibility supported by cosmetic science and regulatory safety data.
How It Works: Works through the mechanism of its molecular class as documented in peer-reviewed cosmetic literature.
Typically Found In: Skin care formulations
TECHNICAL DETAILS
Primary Category: Active ingredient โ cosmetic active
Secondary Functions: Skin conditioning
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.1%โ10%
SOURCING & ETHICS
Vegan Status: Conditional
Halal Status: Yes
Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 โ very low
Comedogenicity Rating: 0/5 โ non-comedogenic
Sensitivity Concerns: Well-tolerated by most skin types.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Good safety profile at recommended concentrations. ewg score: 1โ2.
Works Well With: Standard skincare actives
Avoid Combining With: No known significant incompatibilities
SCIENTIFIC NOTE
Ethanol has an established safety profile within the cosmetic regulatory framework at standard use concentrations.
Last Verified: Cosing database,ethanol technical literature
Primary Sources: 2026-03-12
Water
Common Name(s): Water,purified water,deionised water,inci water
CAS Number: 7732-18-5
DESCRIPTION
What It Does: Provides the universal solvent and vehicle for water-soluble actives and the continuous phase of all o/w emulsions.
Why It's Used: The most essential cosmetic ingredient โ aqua (water) is listed first on virtually all water-containing cosmetic inci labels as the highest-concentration ingredient, serving as the foundation of the global cosmetics industry.
How It Works: Acts as solvent for all water-soluble ingredients (glycols, amino acids, water-soluble actives). forms the continuous external phase of o/w emulsions (lotions, creams, serums). provides aqueous environment for enzymatic and chemical reactions between actives. ph adjustment medium.
Typically Found In: Virtually all cosmetic products โ the most universal cosmetic ingredient globally
TECHNICAL DETAILS
Primary Category: Functional ingredient โ water
Secondary Functions: Skin conditioning
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: Varies widely โ up to 95% in some toners and serums
SOURCING & ETHICS
Vegan Status: Yes โ water (deionised/purified)
Halal Status: Yes
Source Notes: Cosmetic-grade water is purified (deionised, distilled, or ro filtered) to prevent mineral content interference with formulation stability. european pharmacopoeial water (aqua purificata ph. eur.) is the quality standard for pharmaceutical and high-end cosmetic formulations.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 โ non-irritant
Comedogenicity Rating: 0/5 โ non-comedogenic
Sensitivity Concerns: Well-tolerated by most skin types.
Safe for Sensitive Skin: Yes
SAFETY & COMPATIBILITY
Safety Profile: Good safety profile at recommended concentrations. ewg score: 1โ2.
Works Well With: Standard skincare actives
Avoid Combining With: No known significant incompatibilities
SCIENTIFIC NOTE
Water's position as the first inci ingredient on most cosmetic labels reflects the regulatory requirement to list ingredients in descending concentration order โ meaning water is the most abundant ingredient in the majority of cosmetic products. the fundamental role of water as the universal cosmetic solvent and vehicle makes it simultaneously the most important cosmetic ingredient and the one that requires the most sophisticated formulation chemistry to control โ every emulsifier, thickener, preservative, and ph adjuster exists primarily to manage water's interaction with other ingredients in formulation.
Last Verified: Cosing database,eu cosmetics regulation 1223/2009 inci requirements,ph. eur. aqua purificata monograph
Primary Sources: 2026-03-12
Personalized Usage Instructions
How to Use
Step 1
1
Step 2
Remove the comb from the cap by pulling in the direction of the arrow
Step 3
2
Step 4
With the comb end pointing at your scalp, slowly apply the product from the roots little by little as if combing your gray hair
Step 5
Apply the product to all the areas that you are worried about such as your hairline or parting
Step 1
While changing the position slightly, repeat the process about 5 times until the gray areas are completely covered
Step 2
3
Step 3
If it is hard to apply, hold the hair firmly, pulling it away from the face and apply the product or gently push the hair back and apply the product that way
Step 4
4
Step 5
Please ensure the cap is properly tightened after use
Step 1
This product could stain your bedding, so please wash your hair with shampoo before going to bed
Medical Chemicals
Protein/Moisture
- Moisture
pH Level
- Acidic
Porosity Taget
- Normal Porosity
Customized for Your Profile
Scalp Condtions
Sensitive Scalp
Climate Suitability
All Climates
Clinical Claims
Frequency
1. Remove the comb from the cap by pulling in the direction of the arrow. 2. With the comb end pointing at your scalp, slowly apply the product from the roots little by little as if combing your gray hair. Apply the product to all the areas that you are worried about such as your hairline or parting. While changing the position slightly, repeat the process about 5 times until the gray areas are completely covered. 3. If it is hard to apply, hold the hair firmly, pulling it away from the face and apply the product or gently push the hair back and apply the product that way. 4. Please ensure the cap is properly tightened after use. This product could stain your bedding, so please wash your hair with shampoo before going to bed.
Product Information
Paraben-free
Silicone-free