Women are now using Dunkin’ Donuts coffee as hair dye. And it actually kinda works.

Millennial lifestyle site Refinery29 has instructions on how to tint one’s tresses with a cup of morning joe, inspired by a post on the dorm-room web DIY publication Spoon University.

Here’s how it works: Brew two cups of Dunkin’s dark roast, and once it’s ready, mix the cooled grounds with conditioner to form a paste. Soak clean hair with the freshly made java and then apply the paste from root to tip. After it sits for an hour, rinse it out and you should be left with a rich brunette mane. Is there anything coffee can’t do?

Well, maybe it can’t guarantee a perfect finish. Professionals told Refinery 29 that while coffee can dye your hair, the results aren’t exactly “salon-worthy.” Still, using coffee grounds as a hairstyling hack is at least $100 cheaper than going to a specialist, and it doesn’t have all the chemicals found in your typical box of Clairol. Plus the acid in the beans will make your hair “shiny and soft.”

But one expert — while enthusiastic about natural hair-dye remedies — does admit that maybe one should spring for the fancier, organic stuff. Otherwise, “Who knows what chemicals and additives are being deposited in your hair shaft,” she tells Refinery29.