Everyone’s dying their hair these days—and we love it. Why? Because it’s one of the best ways to truly express yourself and show off your unique sense of style. Between highlights, dyes, single process, and double process color, there are so many options out there for getting your hair just the way you want it. But even once you decide on what you want, you still don’t always know what you’re getting yourself into, whether it be at the salon or at home.
For instance, should you wash your hair before you dye it? Should you warn your friends and family that your appearance is about to change dramatically? (For the record, the answer to both is no.) Here are 10 things no one will ever tell you about coloring your hair—but should know.
Tricky, Tricky Multidimensional Color
Multidimensional color can trick the eye into thinking there’s more volume.
If you look closely at photos of most celebrities, their hair isn’t just one shade: Universal hair-crushes like Miranda Kerr and Julianne Hough have multi-tonal dye jobs, which highlight their faces and give the illusion of more movement and body in the hair.
When to Get a Keratin Treatment
If you’re getting a keratin treatment, it’s best to get it when you color your hair. Whether it’s directly after or within a couple of days, a keratin treatment should be done right around the time you color your strands to seal in the color.
You Need More Than Just Shampoo
Shampoo isn’t the only thing you need to buy to protect your color.
Yes, you should be using color-treated shampoo and conditioner formulated specifically for your hair color, but you should also be using a color-protecting styling spray and a UV spray. Harmful UV rays can fade the color of your hair, making salon trips more and more necessary.
Use At-Home Tools for Root Touch-Ups
Whether you get a kit for root touch-ups or simply use a touch-up pen, stretch the amount of time between salon visits with a quick fix of your own.
Use Moisturizer and Petroleum Jelly
Dripping dye onto your skin is a good look for no one. Use your regular moisturizer on your face, then apply a thin layer of petroleum jelly around your hairline before coloring—this way, your skin is protected, and you’ll be able to wipe off the color immediately once you’re done.
It’s OK to Mess Up
Not that we recommend messing up, but it’s comforting to know that with products like Color Oops, your hair color catastrophe can be washed out completely if absolutely necessary.
No Ammonia, Coal Tar, and Lead Acetate
There are a slew of gnarly ingredients that can hide in at-home hair color products, so you should keep an eye out for all of them. Ingredients like ammonia (which can completely dry and fry your hair) and lead acetate (uh, lead poisoning?) should be avoided like the plague. If possible, try to use the most natural hair color you can find, and talk with your colorist about which products they’re using.
Single vs. Double-Process Color
Single process is exactly like what it sounds like: applying one color to the hair at one time. A double process requires bleaching out the hair—the first process—and then toning the color—the second process—to get the desired result. Double processing takes longer and is harsher on your hair, so you should be aware of that going into it.
Going Darker Is Less Damaging
Going lighter means stripping hair of some color and moisture, while going darker means depositing color into your hair. It’s the basic laws of subtraction and addition: Adding color is less damaging; removing your color is more damaging.
Leave Your Hair Dirty Before You Start
Color not only holds better to dirty hair—clean hair can be too slippery—but if you wash your hair before coloring, the dye or bleach may burn your scalp because it won’t have the natural oils to protect it.
A version of this article was originally published in May 2015.