Peroxide & Developer
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
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3%
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20 Volume
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6%
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30 Volume
|
9%
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40 Volume
|
12%
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What strength/volume developer should I use?
10 volume is ideal for use when you don’t want the natural hair colour to be lightened by the dyeing process. It’s used in toners and colour glazes. These types of dyes are known as “deposit-only”.
20 volume peroxide is commonly used with semi-permanent and permanent hair colours. It can have a lightening effect on natural, undyed hair of 1 or 2 shades when used with permanent colour.
When mixed with bleach powder, 20 volume developer will lighten virgin hair by about 5 levels.
30 volume developer is used for lifting out colour. 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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from 1118 reviewsI feel this product, strengthens my hair and I really am glad I found it! I bought it on recommendation from cosmetic world staff, and it has been fantastic
Exactly as I expected.
Works great with Redken Shades EQ products
Thank you so much for having such variety of products and delivering them in timely manner. Happy customer that just repurchased the items again.
I have been using this shampoo, conditioner, and leave in conditioner since it was introduced quite a few years ago. My hair is silky and shiny. However when Redken jacked up their price by nearly $20 USD I began a search for another answer. It turned out that all of the good brands followed suit. $52 bucks for a bottle of shampoo? I don't think so! That's when I did a search and found Cosmetic World. Their pricing is great. I saved over 25% by purchasing from a Canadian company. They shipped right away and packed my order with great care. Plus they were very nice! It will take a bit more time to arrive for US customers, but that is to be expected since it's crossing an international border. I will come here first the next time I need to purchase anything from a beauty supply. Great company, great product, at a price I can afford. Highly recommended!!!
I've used other colour products in the past however this far none the best one. Love the colour, have received many compliments.
This was basically what I was looking for. Nice color in the end.
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I've ordered these products on a few occasions. The product is fantastic, great color and coverage and the service is fantastic. My order is always shipped out in a timely fashion and I get exactly what I ordered. Would definitely continue to purchase in the future.
I like them! Good smell all day.
You can find everything you are asking for . if they don’t have it they will ordered it and make sure to follow up and call you right away
All the employees are very especially Mina she is so nice always smiling and very helpful .
Thank you
Maha Dib
Everyone needs one of these! It's amazing!
Just use the color directly from the tube, no need to mix with anything. Super easy to use.
Color sits very well on hair. Joico always satisfies my needs. I'll see how long does this semi permanent color last.
I,love Schwarzkopf Essensity hair color! Beautiful shades and no drip formula! It’s so easy to do your own coloring at home and save a ton of money!
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