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Deal.ai › Compare

Rainbow Research Henna Hair Color, Black vs The Henna Guys Jet Black Henna Beard Dye

Buy Rainbow Research for hair, and the Henna Guys Jet Black for beards. Rainbow Research is a single-step mix of henna and indigo that coats the shaft and fades over 4-6 weeks; owners say it covers grey, leaves hair shiny and is gentle on sensitive scalps, but some found it dried hair out or came out darker than intended. The Henna Guys is a two-step henna-then-indigo kit with gloves, a cap and instructions, and beard owners report natural-looking grey coverage without irritation, though some got red tones instead of jet black and the process is slow.

  • Choose the Rainbow Research Henna if you want one-step black color for your hair, value a short ingredient list and want grey coverage that fades gradually.
  • Choose the Jet Black Henna Beard Dye if you are coloring a beard, want a kit with gloves and instructions, and prefer triple-sifted powder that mixes smooth.

Prices

  • Rainbow Research Henna Hair Color, Black: $6.10 at Amazon (last seen Nov 9)
  • The Henna Guys Jet Black Henna Beard Dye: $16.97 at The Henna Guys (last seen Nov 14)
  • Difference: the Rainbow Research Henna Hair Color, Black is $10.87 cheaper than the The Henna Guys Jet Black Henna Beard Dye at the latest prices (Nov 9 and Nov 14)
Rainbow Research
Rainbow Research Henna Hair Color & Conditioner, Black

Rainbow Research Henna Hair Color, Black

Rainbow Research Henna Hair Color & Conditioner, Black

5(12 ratings)
$6.10at AmazonChecked Nov 9
See all prices and details
Visit Amazon

Store links may earn us a commission. As an Amazon Associate, Deal.ai earns from qualifying purchases.

Pros
  • One-step mix, simpler than a two-step process
  • Covers grey and leaves hair shiny and soft, owners say
  • Gentle on sensitive skin and scalps
  • Short ingredient list: red henna and indigo only
Cons
  • Some found hair very dry afterward
  • Can come out darker than intended if left on too long
  • Did not cover roots close to the scalp for some
  • No gloves, cap or instructions included
J
Jet Black Henna Beard Dye

The Henna Guys Jet Black Henna Beard Dye

Jet Black Henna Beard Dye

4.6(54 ratings)
$16.97at The Henna GuysChecked 22 h ago
See all prices and details
Visit The Henna Guys
Pros
  • Two-step henna and indigo gives deep black on beards
  • Triple-sifted powder mixes into a smooth paste
  • Comes with gloves, shower cap and instructions
  • Owners report no irritation, even on sensitive skin
Cons
  • Color sometimes comes out red or reddish, not jet black
  • Process is long; the mix can need to sit for days
  • Instructions not upfront about steps like adding coffee
  • Getting the right consistency is tricky for some

What separates them

Rainbow Research Henna Hair Color, BlackThe Henna Guys Jet Black Henna Beard Dye
Intended useHair color and conditioner for the headBeard dye, also usable on hair
ApplicationSingle mix applied in one stepTwo-step henna then indigo process
Kit contentsPowder onlyPowder, shower cap, gloves, instructions
Powder textureStandard ground powderTriple-sifted for a non-clumpy paste
Color resultDeep ebony black that fades over 4-6 weeksAims for jet black but some get red tones
Skin sensitivityReported gentle, even on beards and sensitive skinReported no irritation, even for sensitive skin
Drying effectSome owners report hair felt very dry after useMarketed as conditioning; fewer dryness complaints
Batch freshness6-month shelf lifeMade in small, fresh batches

Price history

  • Rainbow Research Henna Hair Color, Black: lowest $6.10 on Nov 10 at Amazon.

Prices at every store

Rainbow Research Henna Hair Color, Black

  • Rainbow Research Body CareNew

    In stock

    $8.99Checked Nov 7
    Visit Rainbow Research Body Care
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $6.10Checked Nov 9
    Visit Amazon

Store links may earn us a commission.

All 2 stores and price history →

The Henna Guys Jet Black Henna Beard Dye

  • The Henna GuysNew

    In stockReturn policy

    $16.97Checked 22 h ago
    Visit The Henna Guys
Prices and history →

Specs compared

SpecRainbow Research Henna Hair Color, BlackThe Henna Guys Jet Black Henna Beard Dye
Package quantity113 g—
Shipping weight0.16 kg—
Dimensions7.4 x 7.4 x 8.4 cm—
ColorBlack (Deep Ebony)—
Shelf life6 month—
Ingredients—henna and indigo powder
Natural ingredients—100% natural plant-based ingredients
Chemical content—chemical-free
Gluten content—Gluten-free
Powder processing—Triple-sifted powder
Application process—Two-step process
Included accessories—shower cap, gloves, & application instructions
Show all 14 specsShow fewer specs
SpecRainbow Research Henna Hair Color, BlackThe Henna Guys Jet Black Henna Beard Dye
Vegan—vegan
Batch size—small and fresh batches

What reviewers say

Rainbow Research Henna Hair Color, Black

  • 5 / 512 ratings

Buyers rate it 5 out of 5 from 12 ratings and praise it as a gentle, chemical-free way to cover grey on dark hair and beards. Complaints center on dryness after use, patchy root coverage and results darker than expected when left on too long.

What people mention
  • Grey coverageMixedBuyers say it covers grey well overall, but some found roots close to the scalp were not covered.
  • Chemical-freePraisedUsers like that it has no additives or harsh chemicals and suits people allergic to chemical dyes.
  • DrynessCriticisedSome owners report hair feeling extremely dry right after use.
  • Color resultMixedResults blend naturally, but leaving it on too long can make hair darker than intended.

The Henna Guys Jet Black Henna Beard Dye

  • 4.6 / 554 ratings

Buyers with sensitive skin report no irritation and good gray coverage, and many like the natural result. The main complaints are the long two-step process and color that sometimes leans red instead of jet black.

What people mention
  • Skin reactionPraisedBuyers with sensitive skin say it caused no allergic reaction or irritation, including those allergic to other dyes.
  • Gray coveragePraisedMost say it covers gray and white beard hair and the result looks natural and lasts.
  • Color resultCriticisedSome buyers get red or reddish tones instead of jet black, and a few see little change after two tries.
  • Application timeCriticised

Questions and answers

Which is better for a beard?
The Henna Guys Jet Black is built for beards and ships with gloves, a cap and instructions. Rainbow Research works on beards too, but it is sold as a hair product with no kit.
Which gives a truer black?
Rainbow Research is more consistent on black, though it can go darker than intended. The Henna Guys aims for jet black, but some owners got red or reddish results.
Which is easier to apply?
Rainbow Research is a single mix. The Henna Guys is a two-step henna-then-indigo process that takes longer and needs the right paste consistency.
Which is gentler on sensitive skin?
Both are chemical-free and owners of each report no irritation. If you have reacted to chemical dyes before, either is a reasonable plant-based option.
How long does the color last?
Rainbow Research states 4-6 weeks on average and fades gradually. The Henna Guys does not give a figure, but owners say results last.
Is the Henna Guys worth stepping up to over Rainbow Research?
Step up if you are coloring a beard or want the included accessories and sifted powder. Stay with Rainbow Research for simple one-step hair color.

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More comparisons

  • Rainbow Research Henna Hair Color & Conditioner, Black vs Khadi Natural Henna Indigo Hair Color, Black
  • Khadi Natural Henna Indigo Hair Color, Black vs Jet Black Henna Beard Dye
The two-step process is long and the mixture has to sit for days before use.