Blond Studio
9 Oil Developer 20-Volume

9 Oil Developer 20-Volume is rated 4.9 out of 5 by 35.
  • y_2026, m_6, d_5, h_14
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.46
  • cp_1, bvpage1
  • co_hasreviews, tv_23, tr_12
  • loc_en_US, sid_loreal-professionnel-blond-studio-9-oil-developer-20-volume, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_saloncentric
  • bvseo_sdk, dw_cartridge, 17.1.0, p_sdk_3.2.0
  • CLOUD, getAggregateRating, 56ms
  • reviews, product
Select Size
Available options to select
1 ltr.
#E3589902
Auto Replenish:
FREE SHIPPING OVER $50 & EARN 100 PROREWARDS POINTS
  • Choose your frequency. Skip or cancel anytime.
  • Free shipping over $50* & 100 ProRewards Points++ on all recurring orders.
  • Select auto-delivery in cart.
  • Exclusions apply.
Learn More

What It Is

Blond Studio 9 Oil Developer 20-Volume is formulated to be used with Blond Studio 9 Lightening Powder.

What It Does

Blond Studio 9 Oil Developer 20-Volume is oil-enriched to boost the overall performance of the 9-level lightener and smooth the hair cuticle. The oil-base in the developer also offers optimal mixing and application due to its creamy consistency.

What Else You Need to Know

• The 20-Volume Oil Developer is to be used on-scalp, length & ends.

• The 30-Volume Oil Developer is to be used on lengths and ends only.

• Blond Studio Oil Developer is to be mixed exclusively with Blond Studio 9 Lightening Powder.

• The item you receive might not match the imagery on our site. That’s because the packaging recently got a new look! But trust us, it’s still the same great product you ordered!

Service Mixing Ratio Developer Timing
Balayage 1:1 20 or 30 Volume Blond Studio 9 Developer

• Do not exceed 50 min. 

• Do not use heat

Foil Highlights 1:1.5 20 or 30 Volume Blond Studio 9 Developer

• Do not exceed 50 min. 

• Do not use heat

Global on Scalp

1:2 or 1:3 20-Volume Blond Studio 9 Developer

• Do not exceed 50 min. 

• Do not use heat

 

Purchases made in SalonCentric stores may be returned to any SalonCentric store. Purchases made through SalonCentric Customer Service, SalonCentric Business Partners, and SalonCentric.com orders Sold and Shipped by SalonCentric may be returned to a SalonCentric store; however, the return must not exceed $450 and must include the original receipt, packing slip, or invoice. For returns in-store of online orders, the refund will be credited back to the original payment method once the return has been processed. For SalonCentric.com Online Exclusive orders sold and shipped by third-party sellers, please see more details linked below for return steps.

The SalonCentric return policy does not currently apply to Kérastase & Shu Uemura purchases. Kérastase & Shu Uemura do not accept returns.

Click to see more details.

Rated 5 out of 5 by from Great Great product, makes the hair very shiny and healthy feeling
Date published: 2025-11-09
Rated 5 out of 5 by from My favorite! Absolutely love this developer. Blond studio 9 is my favorite lightener and this gives it the best and creamy texture.
Date published: 2025-06-27
Rated 1 out of 5 by from Never arrived Never arrived and local supply store is always out
Date published: 2025-06-13
Rated 5 out of 5 by from I LOVE IT I love this product! Application is always so smooth and creamy!
Date published: 2025-01-29
Rated 5 out of 5 by from Love this creamy developer even tho it says oil is very creamy
Date published: 2024-12-26
Rated 5 out of 5 by from powerful developer I like the creamy texture combined with the powder. It lifts very well.
Date published: 2024-12-01
Rated 5 out of 5 by from Love this product I use this product, the 30 volume and the L’Oréal blond studio 9 lightener together, smooth no clumps, lightens beautifully I highly recommend
Date published: 2024-10-20
Rated 5 out of 5 by from Absolutely love how gentle yet efficient this developer is. I’ve tried others and always come back to this brand.
Date published: 2024-10-02
  • y_2026, m_6, d_5, h_14
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.46
  • cp_1, bvpage1
  • co_hasreviews, tv_23, tr_12
  • loc_en_US, sid_loreal-professionnel-blond-studio-9-oil-developer-20-volume, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_saloncentric
  • bvseo_sdk, dw_cartridge, 17.1.0, p_sdk_3.2.0
  • CLOUD, getReviews, 8ms
  • reviews, product