Purple shampoo has a reputation behind the chair, and not all of it is good. Most of our stylists at Sølvi have spent years rinsing chalky, over-toned product out of clients who left it on too long. So when we put Davines Heart Of Glass Silkening Shampoo on our shelves at the studio, we wanted to know if it actually earned the spot. After months of using it on blonde and highlighted clients in Boise, here is our honest review.
What it is, and who it is for
Heart Of Glass is a silkening shampoo built for blonde and highlighted hair. It carries a violet pigment that neutralizes yellow and brass between salon visits, plus fortifying ingredients meant to reinforce strands that have been weakened by lightening. If you are a balayage client, a bleach-and-tone blonde, or someone who pays good money to stay cool-toned, this is squarely aimed at you. It comes in three sizes: a travel bottle at $18, the standard 8.45 fl oz at $41, and a liter at $102 for the people who go through it fast.
How it performs in the chair
The first thing we noticed is the finish. A lot of purple shampoos leave hair feeling stripped and squeaky, almost like they scrubbed the life out of the strand to deliver the toning. Heart Of Glass does not do that. The hair comes off the bowl glossy and soft, with a slip that holds up through the blow-dry. For our highlighted clients who hate the dry, matte feel of most toning shampoos, that difference is real and you can feel it the moment you run a comb through.
The toning itself is measured rather than aggressive. It pulls yellow and brass down without dumping a heavy violet cast into the hair, which makes it forgiving. That matters because the most common purple shampoo mistake we see is people leaving it on far too long and walking out looking lilac.
How we use it at Sølvi
The directions are simple. Massage it into wet hair, leave it on two to three minutes, then rinse. We tell our blonde clients to treat it as a weekly reset rather than an everyday shampoo, especially here. Boise water and our dry Idaho climate already pull moisture out of lightened hair, so daily violet shampoo on top of that can tip fragile blonde into brittle. One or two washes a week with Heart Of Glass, and a gentler hydrating shampoo the rest of the time, keeps the tone clean without the dryness. If you want us to build that exact home routine around your color, that is a conversation we love to have at your next color or toning service.
The honest drawback
This is not a shampoo for everyone. If your hair is natural brunette, virgin, or you are not fighting brass, the violet pigment does nothing useful for you and you are paying a premium for a benefit you will not see. It is also a toning shampoo, not a deep repair treatment, so badly compromised bleach-damaged hair needs a real bond or moisture treatment alongside it, not this bottle alone. And at $41 for the standard size, it sits at the higher end of the shelf. We would rather tell you that up front than have you buy it and wonder why your dark hair looks exactly the same.
Our verdict
For the right head of hair, Heart Of Glass is one of the easiest products we recommend. It keeps blonde and highlighted color clean between appointments, it does not leave the chalky residue that gives purple shampoo a bad name, and the glossy finish genuinely makes maintenance feel like a treat instead of a chore. If you are a cool-toned blonde in the Boise area, it belongs in your shower. If you are not, save your money for something your hair will actually use.
You can pick it up on our Heart Of Glass product page or grab it in person at our downtown studio at 104 S Capitol Blvd. Not sure if it is right for your color? Come see us. Book an appointment at Sølvi Salon and we will look at your hair in person and tell you straight.