A Color Drop is temporary hair color that sits on the surface of the strand. There is no developer and no lifting step, and nothing gets opened up the way permanent color opens your hair. It lands on top of what you already have and washes out with your next shampoo. Mix Foundation is the other half of the system. It is the diluter, the thing recipes call Base, and its whole job is to soften a shade and take its intensity down. Put the two together and that is the entire system: color that lays on the surface, plus a dial that sets how strong it reads.
It is the part of Blendry the name is about. You blend your own shade, and you decide how loud it is.
How Color Drops work
Most hair color you have used before works by getting inside the strand. Permanent color and bleach both pry open the cuticle, the outer layer of the hair, and change what is underneath. Bleach strips your natural color out. Permanent dye drops new color in and locks it there. Both need that cuticle held open to work, and that is the step that damages hair over time.
A Color Drop does none of that. It deposits on the outside of the strand and stays on the surface. Nothing gets opened, and nothing gets stripped out. Blendry Color Drops are ammonia-free and made with zero peroxide, so there is no developer to mix in and no bleach damage to recover from afterward. They are cruelty-free too.
That surface behavior is also why one wash takes it out. Nothing is locked inside the hair, so there is nothing for shampoo to hold onto. It sits on top, and washing lifts it off. One shampoo and the color is gone, with no slow fade and no root line creeping in, because it never soaked in to begin with.
There is also no rinsing step, which catches people the first time. A Color Drop sets as it dries instead of getting washed out at the sink. You let it dry, then brush it through.
Mix Foundation is your intensity dial
On its own, a Color Drop is as bold as that shade gets. Mix Foundation is how you take it anywhere softer. Add it to a Color Drop and the color turns paler and quieter. In recipes it shows up as Base, which is simply what Mix Foundation is called once it is in the bowl doing its job.
The ratio is what decides the result, and two real recipes show it plainly. Blueberry Milk is one part Ink Blue to four parts Base, so it is mostly Mix Foundation with a little blue worked through it, and it lands as a soft, milky blue rather than a hard navy. Bubblegum is one part Quartz Pink to one part Base, equal measures, so it stays vivid and bright.
More Base makes a shade paler. Less Base makes it bolder. That one ratio is the intensity control for the whole system.
Your one part can be a pea-sized dab or a small spoonful. What matters is that the four parts of Base use the same measure, so the shade comes out the same the next time you mix it. The mistake people make is eyeballing it and adding more color because one part looks like too little sitting in the bowl. Trust the ratio. And since one bottle of Mix Foundation does the softening across everything else you mix, you are not buying a separate diluter for each shade. I broke down the one-to-four Blueberry Milk recipe, and how to push it bluer or softer, in blueberry milk hair at home.
Mixing two Color Drops for a shade no bottle makes
You are not limited to the five Color Drops on their own either. Mix two of them and you reach shades none makes alone. Deep Teal is the clearest example. It is one part Ink Blue and one part Moss Green, plus one part Base: two Color Drops for the color, Mix Foundation to set how strong it lands.
This one is easy to get wrong. Deep Teal still needs Base. The full recipe is Ink Blue 1 : Moss Green 1 : Base 1, and that part of Base is doing the same job it does in every other recipe. The blue and the green give you the teal, and the Base decides whether it reads deep or soft. So even a mixed shade runs on the same dilution logic as a single one.
How to put it on
The method is four steps: mix, apply, dry, brush.
Mix comes first. Rub one Color Drop between your fingers until it works into a smooth, even color. Using more than one, like the Deep Teal blend above? Mix them in a small bowl so the proportion is even before it touches your hair. Then apply. The Tool Kit gives you two applicators, a Fingertip Applicator and a Mascara Wand, and you use whichever gives you better control. Fingertips move fast across big sections, and the wand is easier around your hairline and finer pieces.
Then dry it. Air drying takes five minutes, or thirty seconds with a blow dryer if you are in a hurry. Last, brush it through until there are no clumps and the color sits evenly. There is no rinse at any point. Keep the layer thin while you apply, because a thick coat clumps and rubs off on your collar without making the shade any bolder, and until it is dried and brushed, treat a freshly colored section like wet paint around light fabric.
What your starting color changes
Because a Color Drop lays on top of whatever is already on your head, your starting color decides how bold the result looks. The lighter you begin, the truer and brighter it reads. On light blonde or already-lightened hair, a pastel like Blueberry Milk comes out close to the swatch.
On dark brown or black hair, be realistic about it. Vivid color often needs pre-lightening to show brightly, so on a dark base a Color Drop reads as a tint or a sheen you catch when the light hits it, not neon. That is the honest ceiling of a surface color over a dark base. On a warm brown base a cool shade can also pull slightly green, since warmth sitting under a see-through color does that.
None of this rules out dark hair. It means you test first. Take a Color Drop to a small hidden section, behind your ear or underneath at the nape, dry it, and see what your hair actually does before you commit to a full head. It costs one shampoo to check. I went deeper on getting the most out of a dark base in dyeing dark hair without bleach.
What you need to start
To mix your first shade you need one Color Drop at $21. Mix Foundation is $12, and it is what you reach for when you want pastels or want to stretch a color further. The Tool Kit is $9 if you do not already own applicators. If you already know you will be mixing, a 3-pack of Color Drops is $55 and a 5-pack is $90.
US shipping is free on express orders over $45 and free on priority orders over $85. Blendry ships worldwide in USD, other rates are calculated at checkout, and orders go out in one to three business days.
Every Color Drop and Mix Foundation is on the shop page, and the four-step method is shown with a video for each step on the how-to page. If you would rather start from a specific look, pastel pink without bleach and lavender without bleach each walk a full recipe the same way this system does.