ICYMI: Auburn Is Still Fall's Most On-Trend Hair Color

Mileti describes true auburn as "a copper color with a slightly brown base and a hint of gold." It's a "more mellow sister to copper, the slightly saner cousin to burgundy."

Ryan Sanger from BOMANE Salon in Beverly Hills calls this true auburn color "Copper Auburn." He says it's a color that's overall incredibly warm and rich—just like the metal.

Sun-kissed auburn is a "deeper more red base with lighter and less vibrant ends," Sanger says. "The main difference between them is the gloss/base color that adds the specific tone you want to see." With this specific shade, the highlights will need to be placed close to ends to brighten the overall look and add more dimension. "As for aftercare, I recommend the Davines Alchemic Shampoo ($27) and Conditioner ($31) to preserve and enhance the tones in your hair," he says. For this shade specifically, use the "Golden" version, because it will keep your strands bright.

Plum auburn "has a violet tone to it and is overall a deeper auburn," Sanger says. This shade can look almost chocolate brown in some lighting because its red tones are less fiery and more subtle. It's a shade of auburn for people who are bright color-averse when it comes to their dye preferences and looks like it was practically made for wearing throughout the autumn and winter. Sanger recommends using the same Davines Alchemic Shampoo ($27) and Conditioner ($31) he recommended for sun-kissed auburn, but this time in the "Silver" version, as to keep the cool plum undertones intact. 

Some shades of auburn are so subtle they don't even look red. This is a great color to opt for if you prefer a very natural hair color. If you're on the lighter side of brunette, you can be a bit more lax with maintenance and no one will be the wiser.

"True primary red tone can be as bright and vibrant as you want or more subtle and natural," Sanger says. If you do decide to make the jump and go for something brighter, Mileti recommends staying away from too much color at the roots. He says it's the make-or-break habit to dyeing your hair with a red undertone.

"When I formulate for clients and a fiery auburn is desired, it is very important not to go too far from the natural color so as not to throw off the eye color or skin color. Too many times reds are unsuccessful because they go too fiery at the base (or root), drawing away the woman’s natural God-given coloring."

To avoid a harsh, unnatural color, Mileti says to concentrate the most vivid hues mid-strand. "I like to concentrate bright slashes of color through the body and ends of the hair to create the warmth, fire, and passion that we associate with reds or auburn. Multiple tones are applied via highlighting and low-lighting to create personalized auburn hair color."

On the opposite end of the spectrum, take things bold with a deep, almost burgundy shade and brighter red highlights for dimension. To keep your color salon-fresh, refresh it between appointments with something like the dpHUE Color Boosting Gloss + Deep Conditioning Treatment ($35). Choose the shade closest to your dye job and enjoy semi-permanent color.

Natural isn't always the way to go. Bella Thorne, patron saint of changing hair colors, is probably best known for this fire engine red hue. Prepare to be spotted from about a mile away.

This blonde-ish red hue has a bit of a beachy, sun-kissed vibe without focusing too much on very obvious highlights.

Natural roots and dark auburn braids is a thoroughly modern, playful take on the trend.

This rich chocolate hair color has subtle flashes of auburn that are only really visible when your mane catches the light. To keep your hair smooth and shiny, apply a nourishing shine serum like the Kiehl's Silk Groom Serum ($18), which treats hair using sesame and sunflower oils.

This natural-looking shade is a little bit red, a little bit dark blonde, and a touch brunette.

There's truly nothing like red hair with an Old Hollywood curl. This is total Jessica Rabbit hair, in a wearable shade that draws attention without seeming like it came straight from a bottle.

This golden-hued tone of red reads almost metallic when coupled with high-shine and a chic bob. Darker roots and face-framing blondish-red ends add dimension to the color without giving off a highlighted look.

Sometimes a single tone all over the head can pack a powerful punch. The lack of highlights gives this hairstyle an intensity that will surely draw attention from across a room.

Dark, almost black roots give way to brighter magenta ends.