COSMTEK Dark Brown Hair Dye Shampoo 500ml - Gray Coverage, 3-in-1 Color with Argan & Olive Oil

This 500ml, permanent-acting (semi-permanent in effects) shampoo is designed for both men and women who want an easy at-home color refresh without peroxide or harsh ammonia. Formulated without sulfates, preservatives, or ammonia and enriched with argan oil, olive oil, and turmeric, it deposits pigment while smoothing hair and reducing frizz. Use it like a regular shampoo on wet hair, leave it briefly, then rinse for visible darkening in as little as 15 minutes.

How quickly will I see dark brown color after using COSMTEK?

You can notice a natural dark brown shade after the first 15–20 minute application on wet hair. Results depend on your starting color, hair porosity, and how long you leave the product in; thicker or coarser hair may show deeper coverage with slightly longer processing time.

• Typical development: 15–20 minutes for light to medium gray or brown hair
• Thicker or coarser hair: leave 1–2 minutes longer for stronger pigment
• Best to use on wet hair for even distribution and consistent color
• Repeat application every 15 days to maintain intensity

Will this dry out my hair or cause frizz?

COSMTEK’s formula includes argan oil, olive oil, and turmeric to help hydrate and smooth the hair shaft while depositing color. Because the shampoo is free of sulfates and ammonia, it avoids the stripping and harshness associated with many permanent dyes.

• Argan oil and olive oil help reduce frizz and add shine
• Sulfate-free formulation minimizes moisture loss during cleansing
• Leave-in time is brief to lower the chance of over-drying
• Conditioning effect helps detangle and soften color-treated hair

How long does the color last and how often should I repeat it?

One application typically holds for about 4–5 weeks, fading gradually with each wash. For steady, rich dark brown tone, using the shampoo every two weeks preserves depth and shine without needing permanent dye processes.

• Average wear: roughly 30 days (4–5 weeks)
• Maintenance: reapply every 15 days for consistent color
• Frequency can be adjusted if you shampoo daily or use clarifying products
• Color payoff may fade faster on very porous or frequently washed hair

How should I use it safely and get the best results?

Use like a normal shampoo on wet hair: apply, massage to distribute pigment, leave 15–20 minutes, then rinse thoroughly. Conduct a 24-hour patch test behind the ear before full use to rule out sensitivity.

• Patch test: apply behind ear and wait 24 hours for reactions
• Application tip: ensure even saturation for uniform color
• Rinse completely to avoid color transfer to towels or clothing
• For best coverage, increase leave time slightly on very thick hair

Who is this for: COSMTEK Dark Brown Hair Dye Shampoo suits men and women seeking a low-effort, less aggressive alternative to permanent dye — ideal for covering gray, enhancing natural brown tones, or refreshing color between salon visits. It’s a good fit for people who want a quick in-shower solution with conditioning benefits, those who prefer sulfate- and ammonia-free formulas, and anyone who needs a repeatable, temporary color option without permanent commitment.