Peroxide & Developer
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from 3802 reviewsRemoves brassiness on roots.
I buy all my hair clips at Cosmetic World in a package. Great value, better price than anywhere else including the dollar store. One hair clip will last 1-3 years
Sometimes I just buy a hair product at Cosmetic World without shopping around because I know their prices are better than other shops. The staff is knowledgable about hair colour too.
Everywhere I go people compliment my hair colour, including strangers that walk past me. I mix 7:00 medium blond Igora Royal to cover grey with 7:57 copper blond (nice orange/gold colour, not reddish). With 20% developer to cover grey. It is a really nice darkish copper blond natural looking colour. People are not sure if it is my natural hair colour or not
Excellent produit et livraison rapide! J'achète désormais leur produit en ligne sur ce site qui offre le meilleur rapport qualité prix et surtout la livraison rapide pour la région éloignée.
Excellent produit. On Sent la différence après l'utilisation. Dommage que le produit soit discontinué.
Beautiful chocolate brown color. So easy to apply.
A++++
This bowl is so cute! Love the pattern.
A++++
Wipes are the best. Super easy to use and they remove any color right away. A+++
Smells really good and my hair feels healthier than ever
I use wella oxide with different brands and it works good
First, let me give a 5 star shout out to Cosmetic World for making this product available to non-professionals. I have been shopping here for over 20 years, it is THE best place in Toronto to get products you won't find elsewhere, and great prices as well.
Koleston Perfect 12 series really delivers on the name. It gives PERFECT results!
Eliminates brass!
No need for toner!
Hair stays soft!
Yes it really does get rid of the brass without needing toner, which is a game changer for me.
I use 12-16 with 30 vol developer. Have also tried 12-61 and 12-81 with great results as well.
This LOREAL majirel line has so many lovely shades of blonde . I found this really nice especially for summer as I want to go lighter and brighter . Very pretty - will be buying again !
I love this shade! I used it on my natural black hair to touch up my roots and gave me a gorgeous light brown/golden finish. My original shade was out of stock so I settled for this. I’m so glad I did because this is my be go to shade for summer!
This is a really solid crème developer from Loreal for their Majirel hair dye line. I love the thick consistency and it does take a bit more time to blend and mix however I find this is really good quality. I will definitely repurchase!
What customers think about the store
Store offers extensive professional hair and beauty products with competitive pricing. Fast, reliable delivery and excellent customer service. Wide selection includes major salon brands. Customers praise product quality, helpful staff, and rewards program. Mos... Store offers extensive professional hair and beauty products with competitive pricing. Fast, reliable delivery and excellent customer service. Wide selection includes major salon brands. Customers praise product quality, helpful staff, and rewards program. Most orders arrive quickly and well-packaged.
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Developer comes in different strengths, the common ones being 10 volume, 20 volume, 30 volume and 40 volume. It’s possible to buy peroxide in stronger concentrations but they’re much too strong to use on hair and should be avoided. Developer strength is sometimes represented as a percentage. 6% and 20 vol. are the same strength.
Equivalent Developer Strengths;
- 10 Volume - 3%
- 20 Volume - 6%
- 30 Volume - 9%
- 40 Volume - 12%
What strength/volume developer should I use?
10 volume is ideal for use when you don’t want the natural hair color to be lightened by the dyeing process. It’s used in toners and color glazes. These types of dyes are known as “deposit-only”.20 volume peroxide is commonly used with semi-permanent and permanent hair colors. It can have a lightening effect on natural, undyed hair of 1 or 2 shades when used with permanent color.
When mixed with bleach powder, 20 volume developer will lighten virgin hair by about 5 levels.
30 volume developer is used for lifting out color. Its main use is in bleaching and it can lighten around 7 levels depending on the bleach powder used.
40 volume is occasionally used to lighten very dark, stubborn hair as part of the bleaching process. It lightens quickly and its effects are harsher than lower concentrations. 40 volume is not recommended for on-the-scalp use. Using 40 volume developer can cause hair damage and chemical burns if not used correctly. Instead, using multiple applications using lower volume peroxide will allow more controlled lightening.
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