{"product_id":"cosmtek-dark-brown-hair-dye-shampoo-500ml-gray-coverage-3-in-1-color-with-argan-olive-oil","title":"COSMTEK Dark Brown Hair Dye Shampoo 500ml - Gray Coverage, 3-in-1 Color with Argan \u0026 Olive Oil","description":"\u003cb\u003eCOSMTEK Dark Brown Hair Dye Shampoo is a 3-in-1, color-depositing shampoo that temporarily darkens gray or light hair while cleansing and conditioning, delivering natural-looking dark brown color that lasts up to 4–5 weeks.\u003c\/b\u003e\n\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\n\u003ch3\u003eHow quickly will I see dark brown color after using COSMTEK?\u003c\/h3\u003e\n\u003cp\u003eYou 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTypical development: 15–20 minutes for light to medium gray or brown hair\u003c\/li\u003e\n  \u003cli\u003eThicker or coarser hair: leave 1–2 minutes longer for stronger pigment\u003c\/li\u003e\n  \u003cli\u003eBest to use on wet hair for even distribution and consistent color\u003c\/li\u003e\n  \u003cli\u003eRepeat application every 15 days to maintain intensity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this dry out my hair or cause frizz?\u003c\/h3\u003e\n\u003cp\u003eCOSMTEK’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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eArgan oil and olive oil help reduce frizz and add shine\u003c\/li\u003e\n  \u003cli\u003eSulfate-free formulation minimizes moisture loss during cleansing\u003c\/li\u003e\n  \u003cli\u003eLeave-in time is brief to lower the chance of over-drying\u003c\/li\u003e\n  \u003cli\u003eConditioning effect helps detangle and soften color-treated hair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long does the color last and how often should I repeat it?\u003c\/h3\u003e\n\u003cp\u003eOne 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAverage wear: roughly 30 days (4–5 weeks)\u003c\/li\u003e\n  \u003cli\u003eMaintenance: reapply every 15 days for consistent color\u003c\/li\u003e\n  \u003cli\u003eFrequency can be adjusted if you shampoo daily or use clarifying products\u003c\/li\u003e\n  \u003cli\u003eColor payoff may fade faster on very porous or frequently washed hair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use it safely and get the best results?\u003c\/h3\u003e\n\u003cp\u003eUse 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.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePatch test: apply behind ear and wait 24 hours for reactions\u003c\/li\u003e\n  \u003cli\u003eApplication tip: ensure even saturation for uniform color\u003c\/li\u003e\n  \u003cli\u003eRinse completely to avoid color transfer to towels or clothing\u003c\/li\u003e\n  \u003cli\u003eFor best coverage, increase leave time slightly on very thick hair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho 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.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use COSMTEK on bleached or very light hair?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it deposits dark brown pigment on light or bleached hair, but results vary; a patch test and longer processing time may give stronger color.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is a patch test necessary?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—apply behind the ear and wait 24 hours to check for allergic reactions before full use.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"COSMTEK","offers":[{"title":"Default Title","offer_id":53431008788827,"sku":"B0BC1QQWN6","price":32.01,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1017\/9860\/9243\/files\/cosmtek-dark-brown-front-bottle.jpg?v=1782258500","url":"https:\/\/remediesbeauty.co.uk\/products\/cosmtek-dark-brown-hair-dye-shampoo-500ml-gray-coverage-3-in-1-color-with-argan-olive-oil","provider":"REMEDIESBEAUTY","version":"1.0","type":"link"}