COSMTEK Black Hair Dye Shampoo — Semi-Permanent 3‑in‑1 Color-Depositing Shampoo for Grey Coverage, 400ml

COSMTEK Black Hair Dye Shampoo is a 3-in-1 semi-permanent color-depositing shampoo designed to darken hair and reduce visible grey in one easy wash-and-rinse step.

This color-depositing shampoo combines conditioning, pigment delivery, and gentle cleansing in a single bottle. The upgraded formula supplies concentrated black pigments that blend with your existing color while keeping hair manageable. It’s intended for short-term color refreshes and gradual coverage rather than permanent dye, and results will vary based on hair porosity, starting shade, and application time. Follow the included guidance and perform an allergy patch test before first use.

How do I use COSMTEK Black Hair Dye Shampoo for best results?

Apply to dry hair like a regular shampoo, work through to distribute pigment, leave on for 15–20 minutes, then rinse thoroughly. For more noticeable darkening, repeat the process or extend the leave-in time slightly, observing how your hair responds. Use gloves to avoid staining hands and protect clothing or surfaces.

• Start with clean, dry hair for even pigment uptake.
• Apply a generous amount and massage from roots to tips.
• Leave 15–20 minutes; do not exceed manufacturer guidance without testing.
• Rinse until water runs clear; condition if needed.

Will this shampoo cover grey hair and different base shades?

The shampoo deposits black pigment that can visually reduce grey and lighten-looking strands, especially on lighter greys or lighter brown hair. For very resistant white or coarse grey hair, coverage may be partial and build over multiple uses. Because it’s semi-permanent, expect gradual improvement instead of a one-time permanent change.

• Helps blend greys and create a darker overall tone.
• Best on light brown to medium-grey for quicker visible change.
• White or very resistant greys may need repeated applications.
• Results depend on hair texture and previous treatments.

Is COSMTEK Black Hair Dye Shampoo safe and what precautions should I take?

The formula is designed for topical hair use, but individual sensitivities vary. Always perform a patch/allergy test as directed, avoid contact with eyes, and do not apply to broken or irritated skin. Discontinue use if you experience irritation and consult a professional if concerned.

• Complete a 48-hour patch test before full application.
• Avoid contact with eyes; rinse immediately if contact occurs.
• Do not use on damaged scalp or open wounds.
• Keep away from children and pets; store in a cool, dry place.

How often should I use the shampoo and what maintenance does it need?

Frequency depends on how noticeable you want the color to be: weekly use provides subtle, consistent refreshes while more frequent applications intensify the effect. Because pigment gradually fades with regular washing, maintain results by reapplying as needed and pairing with color-safe conditioners to prolong tone. Track results over a few uses to determine your preferred schedule.

• Start with once per week and adjust based on results.
• Use color-safe hair care products to extend pigment life.
• Avoid harsh clarifying shampoos that strip deposit color.
• Repeat application for stronger, longer-lasting coverage.

Who is this for: COSMTEK Black Hair Dye Shampoo is aimed at people looking for a convenient, non-permanent way to darken hair or blend greys without salon timing or harsh processing. It suits both men and women with light brown, grey, or previously colored hair who want gradual, manageable color refreshes. If you need permanent coverage or have a history of allergic reactions to hair color products, consult a professional before using.