Front of bottle of Blacklight Blonde Science Neutralizing Blue Conditioner 946ml #size_946 ml / 32 fl. oz

Blacklight Blonde Science Hydrating Collection Explained

Product line chart with four sections labeled HYD, REP, VIO, and BLU, each with a set of bottles and corresponding benefits.

Two bottles of Blacklight Blue Shampoo on a blue and purple gradient background with product details.

Two bottles of Blacklight Blue Conditioner on a blue and purple gradient background with product details.

Before and after comparison of a woman with curly hair styled in a black halter top.

Woman with long, wavy blonde hair against a plain background

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Blue Duo Jumbo Size

Name: Blue Duo Jumbo Size
Brand: Blacklight Blonde Science
SKU: F0000-764
Price: 152.00 CAD
Availability: InStock

$152.00 CAD

$190.00 CAD

Best For:

Blonde, highlighted or light brown
Coloured or naturally blonde
In need of brassiness correction and tone refinement
Faded or dull from previous coloring

FREE GIFT ON ALL ORDERS $75+

Free Shipping On all orders $49+

Easy returns 30 days, no questions asked

The Blue Shampoo & Conditioner duo in our largest 32 oz (946 mL) jumbo size. Delivers deep, lasting toning for richer, cooler-toned, more radiant, healthier-looking brunette hair.

About Blue Duo Jumbo Size

The Blacklight Blue Duo Jumbo gently cleanses and conditions while delivering targeted color correction to brassy or orange-toned brunette hair. Formulated with blue pigments and a nourishing blend of superfoods, this duo helps neutralize brass, enhance cool tones, and maintain vibrancy.

This toning system cleans and conditions without weighing hair down, leaving brunette strands richer, cooler-toned, more radiant, and healthy-looking after every wash.

How To Use

Blue Shampoo: Apply to wet hair, massage into scalp and lengths, then rinse thoroughly. Follow with Blue Conditioner.

Blue Conditioner: Apply to towel-dried lengths and ends after shampooing, leave on for 1-2 minutes, then rinse thoroughly.

FAQs

Blue Duo Jumbo Size

Who is the Blue Duo best for?
This duo is formulated for brunette or dark hair with brassy or orange tones. It's ideal if your hair looks warm, brassy, or lacks the cool, rich brunette you want.

Why is this a 32 oz jumbo size?
The 32 oz (946 mL) format is our largest size, designed for salon professionals or at-home use for those who want a longer-lasting supply without repurchasing as often.

Will this weigh down fine or lightweight brunette hair?
No. The formula is designed to tone without heaviness, so hair stays soft and bouncy without feeling weighed down or dull.

Can I use this if I also use a hydrating or repair shampoo?
Yes. Many people alternate the Blue Duo with a hydrating or repair shampoo throughout the week to balance brass control with moisture or strength needs — tone one wash, hydrate or repair the next.

Is this safe for color-treated or chemically lightened hair?
Yes. It's specifically formulated for brunette and dark hair, and it's free from sulfates, salts, parabens, formaldehyde, MI/MCI, gluten, and animal by-products.

Still looking for help? View all our FAQs Here

Shipping & Returns

We offer free shipping on orders over $50 across Canada and the Continental United States. Orders below $50 are shipped at a flat rate of $10.

Our team will typically ship your order within 2 business days. When your package leaves our warehouse, you’ll receive an email with your tracking information.

Most customers receive their order within 3–7 business days from the date of purchase, depending on the destination.

Blue Duo Jumbo Size

$152.00 CAD

$190.00 CAD

Sulfate-Free

Paraben-Free

Gluten-Free

See the difference

Warm and orange to rich and true-toned. Our neutralizing blue products cancel out brassy red and orange undertones — so brunette and darker shades stay vibrant and clean.

Before

After

Blue Duo Jumbo Size

Erase brass. Reveal cooler blonde.

The Blacklight Blonde Science Blue Duo Jumbo Bundle is a complete toning routine designed to neutralize orange tones and enhance cool brunette shades. This duo works together to cleanse, tone, and deeply condition, leaving hair richer, smoother, and beautifully radiant.

Reduce blonde brassiness up to 100%

Read The Report

My blonde used to turn brassy so quickly, but this Blue Shampoo keeps the tone cool and bright. My hair feels clean, soft, and the color looks amazing!

— Kelly L.

The Science

A synergistic blend of skincare actives and superfoods

Argan Oil

Known as ‘liquid gold,’ argan oil is rich in linoleic acid and vitamin E, replenishing the fatty acids and moisture stripped by bleach and colour to make blonde hair softer, shinier, golden.

Moringa Oil

Rich in antioxidants and oleic acid, moringa oil strengthens blonde hair against the everyday stressors that cause colour fading and brassiness. Because blonde hair shouldn’t be fragile hair.

Açai Extract

A superfood rich in polyphenols and omegas, açai fruit smooths the cuticle and enhances elasticity to fight the frizz lightening can cause, protecting blondes from brittle strands.

Squalane

A must-have skincare active for hydration, squalane is a biomimetic, mimicking the scalp’s natural sebum to rehydrate the hair and condition coloured strands from the inside out.

The Science

Trusted by salons, stylists & blondes

Front of bottle of Blacklight Blonde Science Moisture 18-in-1 Beautifier 225ml #size_225 ml / 7.6 fl. oz

18-in-1 Beautifier $16.00

Front of bottle of Blacklight Blonde Science Neutralizing Violet Shampoo 300 ml #size_300 ml / 10.1 fl. oz

Violet Shampoo $16.00

Front of jar of the Blacklight Blonde Science Hydrating Mask 225ml #size_200 g / 7.05 fl. oz

Hydrating Mask $18.00

Front of bottle of Blacklight Blonde Science Moisture Hydrating Shampoo 60ml #size_300 ml / 10.1 fl. oz

Hydrating Shampoo $16.00

Front of bottle of Blacklight Blonde Science Hair and Scalp Oil 45ml

Hair and Scalp Oil $48.00

Jessica M., Los Angeles, CA

Blacklight Blonde Science products feel salon-quality. My hair has never looked healthier or brighter.

Emily R., Chicago, IL

The quality of Blacklight Blonde Science products is incredible. You can tell real science went into creating them.

Sarah K., Austin, TX

I’ve tried many brands, but Blacklight Blonde Science stands out for quality, performance, and beautiful results.

Sophie L., Montreal, QC

Premium formulas, amazing results, and gorgeous packaging. Blacklight Blonde Science truly feels like professional hair care.

Megan T., Vancouver, BC

Finally a brand dedicated to blondes that actually delivers high-quality products that work.

Olivia B., Toronto, ON

Blacklight Blonde Science quickly became my go-to brand. The quality and results are simply outstanding.

The neu [neutralize] Collection

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3 bottles of Blacklight Blonde Science Blue Products for Blonde Hair including a shampoo, conditioner and spray that are included in a bundle

Blue BundleNeutralize orange tones

$93.50 CAD

$110.00 CAD

(4.9)

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Front of bottle of Blacklight Blonde Science Neutralizing Blue Conditioner 200ml #size_200 ml / 6.8 fl. oz

Blue ConditionerFor brassiness correction

From $16.00 CAD

(4.9)

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Save 20%

Image showing the Blacklight Blonde Science Blue Hair Kit

Blue KitEnhance brightness and balance

$72.00 CAD

$90.00 CAD

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Front of bottle of Blacklight Blonde Science Blue Neutralizing Spray 225 ml

Blue Neutralizing SprayFor a blonde refresh

$38.00 CAD

(5.0)

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Front of bottle of Blacklight Blonde Science Blue Shampoo for Blonde Hair 300ml #size_300 ml / 10.1 fl. oz

Blue ShampooNeutralize orange tones

From $16.00 CAD

(4.9)

neu[neutralize]

Save 15%

Image showing the products included in the Blacklight Blonde Science Mini Blue Bundle to Neutralize Hair

Mini Blue BundleNeutralize orange tones

$59.50 CAD

$70.00 CAD

(4.9)

Discover Your Ideal Haircare Routine

Answer a few quick questions to get your personalized routine (and receive a gift!).

Take the hair quiz

Frequently asked questions

Questions about your formula, your order, or your hair? Find our most frequently asked questions below. Still need help? Contact us.

Vist FAQs

How can I contact your customer service team?

Have a question? Our customer service team is here to help, Monday to Friday, 8am to 4pm ET by email at info@blacklightblondescience.com Whether you’d like to learn more about the Blacklight Blonde Science brand, need help choosing the right products for your hair, or have questions about your order or shipment, we’re happy to assist. Reach out anytime and we’ll make sure you get the answers you need.

What makes your products unique?

Every Blacklight Blonde Science formula is made with a synergistic blend of skincare actives and nutrient-dense superfoods, proving that better hair begins with better ingredients.

Can I return a product?

Your satisfaction is important to us. If your purchase isn’t quite right, simply contact our customer service team to request a return authorization and instructions.
Most products can be returned within 30 days, provided they are unused, unopened, and in their original packaging.

Where is your company located?

Our office, warehouse, and production facility are all based in Montreal, Quebec, Canada. We proudly formulate and manufacture our products in-house, all under one roof—powered by one passionate team.

Are your products cruelty-free?

We’re committed to creating professional-quality haircare that delivers real results—without the premium price tag. And of course, our products are cruelty-free. No animal testing here… we prefer to test on happy humans instead!

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Blue Duo Jumbo Size

Best For:

Blue Duo Jumbo Size