COSMTEK Dark Brown Hair Dye Shampoo — Semi-Permanent Gray Coverage, 17.6 fl oz Conditioning 3-in-1

COSMTEK Dark Brown Hair Dye Shampoo is a semi-permanent, 3-in-1 coloring shampoo that covers gray hair and refreshes dark brown tones in about 15–20 minutes.

This botanical-infused hair dye shampoo blends conditioning agents with color pigments to deliver an at-home dark brown shade without a bowl or brush. Designed for both women and men, the formula aims to deposit color, condition strands, and simplify application so you can touch up grays quickly. The product comes in a 17.6 fl oz bottle and includes gloves so one person can complete the process at home.

How quickly will COSMTEK dark brown shampoo color my gray hair?

The dye shampoo begins to deposit color within 15–20 minutes of application. Processing time varies with hair porosity and the amount of gray to cover, but most users achieve a noticeable dark brown result in the stated window.

• Typical processing: 15–20 minutes for visible dark brown tone
• Heavily gray hair may require the full 20 minutes for strongest coverage
• Rinse thoroughly to reveal finished shade

Is the application complicated or do I need special tools?

Application is simple and designed for at-home use — no mixing bowls or applicator brushes are needed. The bottle is applied like a concentrated shampoo; you massage it into wet hair while wearing the included gloves, leave it to work, then rinse.

• No separate developer or mixing required
• Includes plastic gloves for clean application
• Works with straight, wavy, curly, fine, and thick hair

How long does the color last and will it fade quickly?

This semi-permanent formula is formulated to last through multiple washes and is expected to maintain visible color for roughly 2–3 weeks, depending on hair care habits and wash frequency. Color gradually fades rather than growing out instantly, giving a natural transition until root reapplication is needed.

• Expected wear: about 2–3 weeks under normal washing
• Color fades gradually instead of chipping off
• Use color-safe shampoos and cool water to prolong shade

Will this shampoo damage my hair or work with colored hair?

The formula combines conditioning compounds and herbal extracts to help protect and soften hair while it deposits pigment. Because it is semi-permanent and conditioning-forward, it’s generally less aggressive than permanent dyes, but a skin patch test is recommended before first use.

• Contains conditioning agents to reduce dryness
• Suitable for previously colored hair, but results vary
• Always perform a skin sensitivity test before applying

Who is this for: COSMTEK Dark Brown Hair Dye Shampoo is for anyone seeking a fast, at-home way to refresh dark brown hair or camouflage gray strands without permanent chemicals. It suits men and women with a range of hair textures who want an easy single-product routine—especially those who prefer low-fuss application, herbal-influenced ingredients, and a semi-permanent result that fades naturally over a few weeks.