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's hair, showing a shoulder-length layered cut with highlighted blonde tones. The left side is labeled 'BEFORE' and shows the hair in a natural brown shade.

A side-by-side before and after comparison of a woman's hair, showing a straightened, smoother, and lighter brown-to-blonde highlighted result. The left side is labeled 'BEFORE' and the right side is labeled 'AFTER' against a plain light gray background.

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:

Dark 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

This Blue Shampoo & Conditioner duo in our biggest 32 oz (946 mL) size. It helps tone away unwanted orange tones for longer, leaving brunette and dark blonde hair looking richer, cooler, healthier, and more radiant.

About Blue Duo Jumbo Size

The Blacklight Blonde Science Blue Duo Jumbo Bundle is a blue shampoo and conditioner set that helps remove unwanted orange tones from brunette and dark blonde hair. Together, they clean your hair, correct the color, and deeply hydrate it, leaving you with softer, shinier hair and a more beautiful color.

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

Frequently asked questions

Questions about the Blue Duo Jumbo Size? Find our most frequently asked questions here. Still need help? Contact us.

How do I know if I need Blue or Purple (Violet) products?

Check your hair's undertone: if it's brassy or orange, use blue; if it's yellowish or pale/light blonde, use violet (purple).

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.

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.

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

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

(4.8)

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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

$36.00 CAD

(4.8)

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Image showing the Blacklight Blonde Science Blue Hair Kit

Blue KitEnhance brightness and balance

$72.00 CAD

$90.00 CAD

(4.7)

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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

(4.8)

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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

$36.00 CAD

(4.8)

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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

(4.8)

5 stars: 3 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
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Perfect for my balayage

My balayage gets warm SO quickly between salon visits. I use this duo about once a week and it makes such a difference. Plus these bottles are huge lol.

Definitely worth the bigger bottles

I have long thick hair so the regular sizes never lasted me that long. These are perfect and my light brown hair looks way less brassy and much shinier.

Finally a jumbo size

I've been using the blue shampoo and conditioner for months and was going through them pretty fast. So happy they come in this size now! Keeps my highlights from getting orangey.

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Blue Duo Jumbo Size

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Blue Duo Jumbo Size