Anyone who has tried making a drastic hair color change on their own will likely tell you it is best left up to the professionals - especially when it comes to going from brown to blond.
This is why so many viewers were ruffled by Jennifer Lawrence's magical at-home hair dye experience portrayed in her new film Red Sparrow, where she goes from dark brunette to platinum blond in just one dye session.
Viewers were then left even more baffled when Jennifer's character follows up this feat by swimming in a chlorinated pool and emerging with her platinum locks unaffected.
One to another: Viewers of the movie Red Sparrow have been riled up by the movie's portrayal of dying hair from dark brown to platinum blonde
Part of the job: The film stars Jennifer Lawrence as a Russian spy who specializes in seducing her targets
In fact, despite the movie's plot being based on a Russian ballerina becoming a spy seductress, many users called the dye job the 'most unrealistic part' of the film.
'I loved red sparrow but all I could think was how she got her hair from brunette to perfect blonde with one box dye?' wrote one viewer on Twitter.
Another user, who happens to be a beauty editor for Allure, added: 'Not that I was expecting Red Sparrow to be an accurate representation of what it’s like to be a Russian spy but I draw the g-d line at dyeing your hair brunette to blonde with BOX DYE & WITHOUT GLOVES.
'Consider my disbelief the opposite of suspended!!'
In reality, going from a dark brown or black hair color to white-blond involves spending at least one full work day in a salon, and sometimes even more.
And according to celebrity hair stylist and Gemini 14 salon owner Kathy Benghanem, attempting to perform the color change at home yourself could end up ruining your hair - and leave you forced to visit a salon anyway in order to repair the damage.
'I never recommend lightening your own hair as a DIY,' she told DailyMail.com. 'This is a difficult process [even when done] by a hair professional, and [is one that] involves experience and great products.
Taking a hit: But a scene that sees Jennifer's character go from brown to blonde with one box put many viewers' backs up
Not just a slip: The issue has been cited in various reviews of the film because it was so tough to ignore
Hair today: The real process would take a whole day in a salon with several bleaching sessions before the platinum color could be added
'Most of the time at the salon we spend more time fixing DIY hair than it would have taken if the person initially came to the salon. I highly do not recommend this.'
Indeed, Monae Everett, a New York-based hairstylist, explained to Yahoo how things start with stripping color from the hair - a process that certainly can't be done with a simple box dye at home.
'In order to go blond, the hair must be lightened through brown, red, orange, and yellow stages,' she said.
'Normally this takes one or two bleaching sessions, and at least three to four hours before you can add the platinum blond color.'
After the one or two bleaching sessions, it will be at least three or four hours before the platinum color can be added. In total, the process can take in excess of 10 hours and cost more than $750, a far cry from the speedy at-home process captured in Red Sparrow.
Just a blemish: Even those who came out loving the film couldn't help but be irked by the 'completely inaccurate portrayal'
No no: Despite the film being about a ballerina who becomes a Russian spy, many branded the hair dye scene the 'most unrealistic' part of the film
Even women with access to the best in hair styling would scoff at the depiction in the film. Kim Kardashian recently lamented the 13 hours she had to spend getting her own platinum look.
But if it weren't already ridiculous to think that Jennifer's character could go from brown to blond in a snap, she then hops into a pool with her freshly bleached hair. Chlorinated pools can leave light locks with a green hue, and at the very least leave it damaged and dry to the point of breaking.
The flub up was even cited in various damning reviews of the film, including in the Village Voice, where reviewer April Wolfe wrote: 'For the men who have never had at-home-hair-dye disasters, here are some tips: You can’t successfully bleach your hair blonde with store-bought box dye; long and/or thick hair requires multiple boxes; you cannot, under any circumstances, go swimming in a chlorinated pool after you bleach.
'This may seem like a piddling quibble, but if you want women to trust that you have made an earnest effort to dissect a woman’s psyche, don’t just assume you know the details.'