Free Complement Neutralizer
Pick any color and your palette, choose the gray value and whether it should lean warm or cool, and get the best-ranked neutralizer with its dose, the step-by-step path and warnings before the mix turns to mud. Then print a chart of chromatic grays from your palette's cleanest complementary pairs. Exports PDF. Free, with no sign-up, and it runs in your browser.
This palette has no colored paint to neutralize with. Titanium White and Ivory Black only change value, so choose a palette with a complement.
Two complementary paints mixed across, from A through their neutral to B, and lightened with white. Greys mixed this way stay alive where a black-and-white grey looks flat.
Paper
Warm or cool grays.Aim at a neutral gray or one leaning slightly or clearly warm or cool; the search and the fit follow the lean.
Mud warnings.Flags complements that darken the mix, four or more pigments in one mix, and the overshoot past neutral.
Chromatic gray grid.Two complements mixed across in nine steps and tinted with white, with the palette's cleanest pairs suggested.
Printable chart.A PDF of chromatic gray grids, two pairs per page, each with an empty row to paint your own mixes into.
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What does it mean to neutralize a paint color?
Neutralizing a paint color means lowering its chroma toward a gray by mixing in a paint of the opposite hue, its complement. The Complement Neutralizer tests each colored paint in your palette against a hex color, finds the dose where chroma bottoms out, then adds white or black to move the gray toward a chosen 1–10 value.
How to use the Complement Neutralizer
The tool takes 6 steps, all on your device.
Enter the color you want to neutralize as a hex value, from your reference or your palette app.
Choose the gray value (1–10) the neutralized mix should land on, and its temperature: neutral, or slightly or clearly warm or cool.
Pick the palette you're working with: the full studio set or a classic limited palette.
Read the ranked neutralizers: the dose to add, whether the value needs a touch of white or black afterwards, and how close the result lands.
Follow the neutral path strip: add the neutralizer gradually and stop at the chroma you actually want. The last swatch shows half a dose too much, and any mud warnings sit under the recipe.
Below, under Chromatic greys, pick one of the palette's cleanest pairs (or any two paints) and read the grid from paint A through their neutral to paint B, lightened with white. Download the chart to paint your own mixes beside the predictions.
What the Complement Neutralizer does
The Complement Neutralizer lowers chroma first and value second, with a measured dose from one paint or two.
Chroma first, then value
The Complement Neutralizer splits graying a color into two jobs: it finds the dose of each paint that brings chroma to its lowest point, then corrects value with Titanium White or Ivory Black. It is part of our color tools for artists, which answer color questions in amounts of real paint.
A measured dose
The dose comes from a ternary search between 0 and 12 parts of neutralizer per part of your color, each trial mixed with the Kubelka-Munk model. It lands where OKLab chroma is lowest, not on a fixed 1:1 rule.
Two-paint neutralizers
Two-paint neutralizers are the four best single paints premixed 1:1 in every pairing. Each pair carries a 0.01 ranking penalty, so a single tube wins a tie.
Fit against an ideal gray
Every candidate's fit is the OKLab distance between its value-corrected mix and the target gray: neutral, or carrying 0.015 or 0.03 of OKLab chroma toward orange (warm) or blue (cool), the axis the color temperature map reads. The labels read excellent under 0.03, close under 0.07, workable under 0.12 and rough above that.
Studio set or a limited palette
The palette choices are the full studio set of 22 pigments or the Zorn (4 colors), Classical earth and Modern warm/cool presets.
Settings kept in the link
The hex color, gray value and palette are stored in the page address, so a copied link reopens the same search.
For painters who gray a color without killing it
Beginners, art students, working painters and art teachers gray a color with it and keep the color alive.
Beginners
Beginners can keep the default red, #c8281e, and watch the neutral path take its chroma down step by step.
Art students
Art students can compare the ranked list under Zorn (4 colors) and Full studio (22) to see what a missing complement costs.
Working painters
Working painters can type a passage's hex code, set the Gray value to its shadow value, and take the dose to the palette.
Art teachers
Art teachers can project the neutral path and its chroma numbers to show how each quarter of the dose changes a mix.
Neutralizing is a skill, not a shortcut
The hard part is knowing which paint opposes the color in front of you, and how much to add: too little changes nothing, too much sails past neutral into the complement's own hue. The color wheel shows where a color's complement sits on a painter's RYB wheel; this tool answers the dose question for the paints you have.
How the neutralizer is found
The textbook complement does not always win. For the default red, #c8281e, at value 5 on the full studio set, the list opens with Cerulean Blue at about 1¾ parts per part of red, then Cobalt Blue at 1⅔. White and black pigments are left out of the ranking because they only set value; a palette with nothing else shows a message instead.
The neutral path: chroma as a dial
Full neutralization is rarely what a painting wants: a shadow that stays slightly warm reads as alive, and the same shadow fully neutral can read as dead.
For the default red, the chroma numbers from the tube to the full dose run 20, 11, 5, 2 and 0: most of the color goes in the first half of the dose.
When a gray turns to mud
Mud is what painters call a gray that looks dirty instead of quiet. Three measurable causes are flagged under the recipe. Complements often darken each other: for the default red, the neutral mix is 0.7 values darker than either paint, and more paint only makes it heavier, so lift it with white. Every pigment added dulls a mix further, so four or more in one pile get a warning. And past the neutral point the gray turns toward the complement's own hue: the path's last swatch shows half a dose too much, which for the default red already leans blue.
Chromatic grays from a pair
The classic exercise is to mix two complements across: paint A, then A with a quarter, half, three quarters and all of the dose of B that neutralizes it, then back out to pure B, and each column lightened with white. The grid does this for any two paints and suggests the pairs in your palette that reach the cleanest neutral. Ultramarine Blue and Burnt Sienna, the familiar pair, reach neutral at about 0.83 parts Burnt Sienna to 1 of Ultramarine; Cadmium Red Medium needs about 1.77 parts Ultramarine.
Print the chart and paint each mix into the empty row under its prediction: the differences teach you your own tubes.
Value control after neutralizing
The black is Ivory Black, about value 3.5 in the tool's pigment data. No mix goes darker, so targets of 1, 2 or 3 show a note; so does 10, which is lighter than the white. A recipe that falls short says the closest value it reaches.
Further reading
The page below goes further into the ideas the Complement Neutralizer works with, and opens on the site named beside it.
- Color mixing and neutral theory for painters (ArtisticMasterclass.com)
Tips from a working artist
From Sujith Puthran, artist and founder: what I actually do at the easel.
Neutralize toward the shadow's value, not the light's: grays do their best work in the darker half of the value range.
Stop at 50–75% of the full dose for chromatic grays that still lean toward the parent color.
If the best candidate is 'rough', your palette lacks a true complement. Add one paint near the gap rather than stacking three.
Questions about the Complement Neutralizer
The 4 questions below cover why black and gray fall short, how the best paint is chosen, and colored grays.
The theory
Why not just add black or gray to a color?
Adding just black to a color lowers its chroma by burying the color in a dark, so its value drops at the same time and large passages can look flat. A complement cancels the hue instead, and the tool sets value separately with white or black, which never rank as neutralizers.
Using it
How does the tool decide which paint neutralizes best?
The tool decides which paint neutralizes best by mixing each colored paint in your palette with your color across a range of doses, using a Kubelka-Munk paint-mixing model. For each paint it finds the dose that comes closest to the gray you chose (neutral, warm or cool), corrects the value with white or black, and ranks candidates by how close the result lands to that gray. The paint mixing simulator mixes the same pigments by parts at any other ratio.
What if the result says 'rough'?
If the result says 'rough', either your palette has no paint close enough to the color's complement, or the gray value is darker than Ivory Black can reach. For a missing complement, add one well-chosen paint near the opposite hue family rather than mixing more.
Grays and media
Can I neutralize to a colored gray instead of a perfect neutral?
Yes, you can neutralize to a colored gray in two ways. Set Temperature to a warm or cool gray and the dose aims at that gray, or stop the path strip before the full dose to keep some of the original hue.
Enter the color, set the gray value and stop the neutral path where the mix still leans toward its parent hue.
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