The 8 Best 30 40 Developers (2023 reviews)

The loréal paris 30 40 developer should be able to handle its purpose and duties with ease. The 40 developer is the strongest one you should consider using on your hair. It can be used in combination with l'oréal blue powder. It's creamy and does a good job of lifting. This works great for mixing with the hair bleach powder and the dyes that need a developer.

The rich, creamy formula gives you easy application and beautiful uniform results every time. It provides a good level of lightening for very blonde shades. This is just the developer, the stuff you mix in with a bottle of hair color to activate the color in the hair dye. It's also a great cream developer.

Why We Like This:

Developer for your perfect hair color
Works wonderfully but has quite a strong odor
Great developer if you need to bleach very dark hair
Lightened with no visible additional damage

Best With true colors: Marianna Beauty Accessories 30 40 Developer

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We know from years of feedback from readers, customers and amazon sellers, what most people want in a convenient and appropriate developer. The marianna beauty accessories 30 40 developer is exactly that - it's a simple developer that hits all the right notes. It comes with black hair, even natural, you will have a tough time getting it lifted to a blonde without frying it. This works perfectly to lift to a light blonde for vivid colors. It's thick, a little runny but still fairly creamy.

It does it's job, the least time left on hair, the less damage it does to it. It works great for whitening plastic, providing the sun comes out where you live for a full day. This gives it just enough body to stay in place, but enough moisture to stay wet and keep in contact with the hair as it foams and expands while the hair dryer heats it. This cream will remove the yellow and restore the original color.

Why We Like This:

Whitened yellowed plastic bathtub jet controls
Works great for european skull mounts
Lightens fast with not a lot of damage to hair
Lifts hair quickly, and makes a nice consistency with bleach

Best For medium brown Or lighter Hair: Loréal Paris relaxed Hair

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Best part: loréal paris relaxed hair costs comparatively low and it is available to ship in 24 hours. The L'Oréal cream developer is one of the best around, the 16 oz bottle allows for many uses for dying and bleaching purposes, not bad smelling either. It helps to lighten darker hair easily. This is just the developer, the stuff you mix in with a bottle of hair color to activate the color in the hair dye. It does take the dyed hair color you have.

This is specifically meant for powder and toner, not to be mixed with purple shampoo or any other products. The developer works because it has hydrogen peroxide as a lightener, which replaces the need for bleach. It is great to whiten old plastics. It’s more like a travel size.

Why We Like This:

Lightened with no visible additional damage
Works super well and keeps hair soft
Super creamy, and does exactly what it needs to

Best For Blonde Hair: 30 40 Developer

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The 30 40 developer should be able to handle its purpose and duties with ease. It is a line for consumers who are not stylists yet have more knowledge on hair coloring beyond a box kit. It is good for bleaching dark black hair. It smells great and is more on the watery side versus cream side. It takes on the toner you are using.

This comes with the activator lotion (which is the developer) and it makes your hair have a shine to it. The liquid works just fine but it is messier than the creme. It makes it feel second hand to not be full and to be dented and not factory sealed. The clear developer it is a liquid and will not thicken up with pigment.

Why We Like This:

10 volume developer is meant to deposit pigment into the hair without lift
Clear comes in 20 volume up to 2 levels lift
Delivers what they promise

Best For those: Super Star 30 40 Developer

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We would, of course, be remiss if we didn't mention super star 30 40 developer for daily usage. It is great for a first time use. This bottle is big enough to do several skulls. The size of these are everything and then it’s filled to the top.

Why We Like This:

Great for bleaching a european mount
Worked great at whitening a deer scull for final step
Good investment for long term

Best For bottom part Of shoes: Salon Care 30 40 Developer

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The features department is where salon care 30 40 developer truly manages to shine. It can cause severe irritation and loss/breakage of hair. It can be used by non-professionals on a human head. It comes with different vendors and also works well to lighten grey hair. The part that works really does bring it back to its original white or Normal color.

It is good for a fast lifting with bleach. It can be used for bleaching deer antlers for mounting. It doesn't take much one bottle will do roughly 4-6 skulls depending on size.

Why We Like This:

Will help lift black hair dye
One of the new comers and featured product

Best With wide array Of Hair Color brands: 30 40 Developer

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Next on the list, we've got yet another developer that manages to win our hearts. It's the 30 40 developer and it's widely considered as developer that has the most suitable features. This works with a wide array of hair color brands. They dictate the amount of peroxide in the developer, which determines how much the hair cuticle is opened. It makes it really easy to work through the hair evenly across a root touch up. It will also only lighten up to a certain point when used with bleach, and is best used when you only want to go a few shades lighter.

This strength of developer, 20 volume, is meant to be used with hair color that lightens the hair a few levels. It is easy to use/mix developer and will continue to use it.

Why We Like This:

Replenishes hair with essential components, 100 % gray coverage and rich color
Good investment for long term

Best For Red Hair: Pravana 30 40 Developer

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The pravana 30 40 developer is suitable and reliable and fits well with your daily purpose. Pravana is a professional salon formula and requires some familiarity with how to mix your own dye to lift formulas. It will lift virgin hair color and last quite some time. It lightens faster and with more intensity. It is a big bottle that should last quite some time.

Why We Like This:

Without the headache of scalp irritation
New and hot release