--- product_id: 1293315 title: "RAINBOW RESEARCH Dark Brown Henna - 4 oz." brand: "rainbow research" price: "€ 15.96" currency: EUR in_stock: true reviews_count: 8 category: "Rainbow Research" url: https://www.desertcart.pt/products/1293315-rainbow-research-dark-brown-henna-4-oz store_origin: PT region: Portugal --- # 4-6 weeks lasting color smoothes & seals for shine 100% natural, pesticide-free RAINBOW RESEARCH Dark Brown Henna - 4 oz. **Brand:** rainbow research **Price:** € 15.96 **Availability:** ✅ In Stock ## Summary > 🌈 Unlock timeless beauty with every strand—because your hair deserves the natural glow of royalty. ## Quick Answers - **What is this?** RAINBOW RESEARCH Dark Brown Henna - 4 oz. by rainbow research - **How much does it cost?** € 15.96 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/1293315-rainbow-research-dark-brown-henna-4-oz) ## Best For - rainbow research enthusiasts ## Why This Product - Trusted rainbow research brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pure Botanical Power:** Crafted with zero additives, chemicals, or pesticides—just nature’s finest henna for guilt-free beauty. - • **Grey Coverage Mastery:** Effectively covers greys while enhancing hair texture, giving you a youthful, polished finish. - • **Long-Lasting Radiance:** Enjoy rich, dark brown hues that fade gradually over 4-6 weeks, keeping your look fresh and vibrant. - • **Shine & Strength Boost:** Smooths and seals each hair shaft, delivering enviable shine and body that turns heads. - • **Customizable Color Experience:** Blend and layer for special effects or subtle shifts—perfect for the creative professional who stands out. ## Overview Rainbow Research Dark Brown Henna is a 4 oz. pesticide-free, cruelty-free powder that delivers semi-permanent, natural dark brown hair color lasting 4-6 weeks. It smoothes and seals hair cuticles for enhanced shine and body, covers grey hair effectively, and improves hair texture without any chemicals or additives. Ideal for all hair types, this henna offers a customizable, gradual fade and a rich botanical experience inspired by ancient beauty rituals. ## Description Rainbow HennaRainbow Henna has no additives, chemicals, or pesticides. Rainbow Henna coats each hair shaft with color. Blends naturally. Fades gradually. Lasts 4-6 weeks. Smoothes and seals the hair's cuticle for greater shine and body. Our custom-tailored recipes can be used for special effects, covering grey, and improving texture.Note: Henna has no lightening action.History of HennaSecrets of beauty have been cherished throughout the ages. One of the oldest beautifers known is Henna. Famous beauties such as Nefertiti and Cleopatra used Henna to enhance their hair coloring. Silent film stars Theda Bara and Clara Bow colored their hair with Henna to add to their mystery. Today, Henna is used by women and men who understand how to be naturally beautiful. Review: but as it oxidizes it turns brown beautifully. Happened to me - Brings medium/light brown up a shade to darken. The high concentration of indigo may turn grey hair green for a few hours-days, but as it oxidizes it turns brown beautifully. Happened to me! However, if you dyed your hair with anything other than this brand of henna (i.e. any henna that has metallic in them) it will turn your hair green-blue permanently. If you want to use this product, which I highly recommened, then use a lighter shade of henna until your chemically treated hair grows out, or cut it short, or go with it and rock green hair for a while! Like I said if you only used henna to dye your hair you will be fine as long as it doesn't have metallic salts. Don't freak out if your hair turns green for a few hours. Such a beautiful shade of brown. I am a huge supporter of henna b/c not only does it make me look and feel great, more importantly to me at least it coats the hair in plant goodness and makes it shiny and manageable for months. I don't know how it does this but before I used heann, hair was frizzzzzzzzzzzzzzyyyyyyyyyy Review: Good - Love this henna product I always order to cover up my greys. It last 4-6 weeks and I jsut do it over again. It covers up very good. I love it and will keep using it. ## Features - Rainbow Research ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00EZL8QBU | | Best Sellers Rank | #45,280 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #46 in Hair Hennas | | Brand | Rainbow Research | | Brand Name | Rainbow Research | | Color | Brown | | Container Type | Bottle | | Customer Reviews | 4.0 out of 5 stars 278 Reviews | | Hair Color Permanence | Semi-Permanent | | Hair Type | All | | Item Form | Powder | | Item Weight | 4 ounces | | Manufacturer | Rainbow Research | | Manufacturer Part Number | 0623025 | | Material Features | Cruelty Free | | Material Type Free | Pesticide Free | | Model Number | SG_B00EZL8QBU_US | | Number of Items | 1 | | Package Information | Bottle | | Product Benefits | Anti-Aging | | Recommended Uses For Product | Hair Coloring, Covering Grey Hair, Improving Hair Texture | | UPC | 000518400033 | | Unit Count | 4 Ounce | ## Product Details - **Brand:** Rainbow Research - **Color:** Brown - **Item Form:** Powder - **Package Information:** Bottle - **Product Benefits:** Anti-Aging ## Images ![RAINBOW RESEARCH Dark Brown Henna - 4 oz. - Image 1](https://m.media-amazon.com/images/I/81qIQiKctqL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Questions & Answers **Q: Should you try this if you have short hair and balding ?** A: It may depend why you are balding--your bare scalp could be extra sensitive. I used it on my hair that was about 3/4" long, growing back after chemotherapy with no ill-effect. I often use a tablespoon of melted coconut oil in the preparation which helps condition dry hair and skin. **Q: why is my scalp so itchy and after leaving the henna for six hours did not change my original brown and gray hair?** A: six hours is very long. you have to heat up your head. I use a dryer with the plastic cap. and cook for 1/2 hour then keep in for 1/2 hour and it covers my gray. I also use coffee rather then water. You have to heat it up that's a must. **Q: Can this be used for tattoos?** A: Yes, but they would turn out better if you got body art quality straight henna. If you do end up getting this product use lemon juice or another acidic juice, not boiling water. Also make sure to let the henna sit 2 hours or more for the dye to release. **Q: How long does it take the henna to release dye ?** A: because I use it to cover my grey hair, I use strong coffee and a spoon of apple cider. Mix it into a muddy mixture and apply. I cover with a plastic cap and sit under the dryer for 45 minutes. that's it, and works great. ## Customer Reviews ### ⭐⭐⭐⭐⭐ but as it oxidizes it turns brown beautifully. Happened to me *by B***S on July 18, 2018* Brings medium/light brown up a shade to darken. The high concentration of indigo may turn grey hair green for a few hours-days, but as it oxidizes it turns brown beautifully. Happened to me! However, if you dyed your hair with anything other than this brand of henna (i.e. any henna that has metallic in them) it will turn your hair green-blue permanently. If you want to use this product, which I highly recommened, then use a lighter shade of henna until your chemically treated hair grows out, or cut it short, or go with it and rock green hair for a while! Like I said if you only used henna to dye your hair you will be fine as long as it doesn't have metallic salts. Don't freak out if your hair turns green for a few hours. Such a beautiful shade of brown. I am a huge supporter of henna b/c not only does it make me look and feel great, more importantly to me at least it coats the hair in plant goodness and makes it shiny and manageable for months. I don't know how it does this but before I used heann, hair was frizzzzzzzzzzzzzzyyyyyyyyyy ### ⭐⭐⭐⭐⭐ Good *by A***R on November 5, 2025* Love this henna product I always order to cover up my greys. It last 4-6 weeks and I jsut do it over again. It covers up very good. I love it and will keep using it. ### ⭐⭐⭐⭐ Good Coverage in One-step Process *by V***S on December 19, 2015* [I ordered Rainbow Research dark brown henna but was sent the wrong colour. I returned and ended up buying it elsewhere.] In looking for a natural, non-toxic hair dye, I came across henna. After using neutral henna (Cassia obovata) twice which conditions the hair while giving a lovely shine, I was ready to try something with a little colour. Henna (Lawsonia inermis) is a permanent dye that improves your hair. Henna binds the keratin in your hair and cannot be removed so it is a commitment. It 'only' dyes red. In order to get brown, Indigo (Ingiofereae) is used. For best results, a long, full day, two-step process is used for dark brown. You do the henna, rinse out then do indigo. The Rainbow Research henna is a one-step process with the henna and indigo powders mixed together. Mixing with boiling water causes an instant dye release so there is no long dye release period as there is when using just henna. Henna treatments are done full head until you get the desired colour then roots only if you don't want further darkening. Application 1: I mixed one jar of the Rainbow Research henna with boiling strong coffee and two tablespoons of apple cider vinegar to form a mud thick enough to not to drip, thin enough to spread. I applied the mud, covered with a disposable shower cap and let sit for 4 hours. I have to tell you, the coffee may have added colour but stunk! Washing out wasn't too bad except for the indigo. There were flecks of indigo everywhere and more came out the second wash. The colour was good, more of a dark yellow on my greys than red. The indigo continued to bleed, coming off on my hands until the third wash. Application 2 (10 days later): I mixed one jar of the Rainbow Research henna with boiling water and two tablespoons of apple cider vinegar to form the mud. I applied the mud, covered with a disposable shower cap and a self-warming cap then let sit for 5 hours. Rinsing out was smoother than the first application. The colour was deeper with lots of shine. My greys are more of a mid to deep auburn. The indigo again bled. I really like the end result of the two applications. My hair is shiny, healthy looking and feels stronger. It is a bit thicker, less frizz and my curl pattern (2b/2c) loosed. The colour is a deep brown with reddish, golden, copper highlights where the greys were. This is a nice, all natural henna blend that is easy to use in a one-step, time saving process. There is no PPD or metallic salts that can be problematic. It is sifted but little pieces of stem become apparent when washing out. The main downside is the indigo bleeding which ultimately means it isn't staying on the hair so after a couple of washes, your hair lightens a little especially the greys. I would recommend this henna blend. Be aware that henna is a natural dye, so more than one application is necessary. Henna is permanent as is indigo although indigo when in a blend doesn't stick to the greys hairs as well as it would in a two-step process. Also be aware that henna may loosen your curl pattern and each application will loosen further. I highly recommend reading up on henna on hennaforhair.com. ## Frequently Bought Together - RAINBOW RESEARCH Dark Brown Henna - 4 oz. - Rainbow Research Henna Hair Color and Conditioner, Persian Black Deep Ebony, 4 Ounce - Rainbow Henna Persian Dark Brown Hair Color 4 Oz, (2 pack) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/1293315-rainbow-research-dark-brown-henna-4-oz](https://www.desertcart.pt/products/1293315-rainbow-research-dark-brown-henna-4-oz) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-08-31*