Choosing and Mixing Paints for a Physical Paint-by-Numbers

A boxed paint-by-numbers kit comes with little numbered pots, pre-mixed to match its canvas. Print your own canvas and that convenience is gone — you bring the paint. That turns out to be half the fun: you choose the medium, you mix each colour, and the painting is yours down to the pigment. This guide covers which paints to buy, the small set that mixes almost anything, and how to match the numbered swatches on your printed palette key.

Your shopping list already exists, by the way: the palette page that comes with the blank canvas download shows every numbered colour in your painting. Print it in colour and bring it to the art shop — or mix towards it at home, swatch by swatch.

Pick your medium

For painting on canvas, acrylics are the default for good reason: they’re opaque enough to cover the printed lines, they dry in minutes so you can work colour-next-to-colour without smearing, mistakes paint over cleanly, and everything washes up with water. Oils give you longer blending time and a classic finish, at the cost of days of drying and solvent clean-up — lovely if you’re patient, unforgiving if you rest your hand in wet paint. Gouache sits in between and suits paper printouts; watercolour is the one to skip, since its transparency fights the flat, opaque look paint-by-numbers is built on.

The small set that mixes everything

You don’t need a tube per numbered colour — a 24-colour painting mixes comfortably from six to eight tubes. The workhorse set: a big tube of titanium white (you’ll use more white than everything else combined), a warm and a cool yellow, a crimson-leaning red, an ultramarine blue, plus burnt umber (brown) and a small black. Those cover skies, skin, foliage and shadows; anything else — a vivid magenta sunset, a turquoise sea — buy as a single extra tube rather than fighting to mix it.

Mixing to match the printed key

Work beside the colour-printed palette page and match one numbered swatch at a time. Start from the swatch’s dominant colour, then add the stronger pigment in tiny steps — always dark into light, a knife-tip at a time, because a drop of blue moves a pool of white much further than the reverse. Judge the match by dabbing a little on scrap paper and letting it dry: acrylics dry noticeably darker than they look wet, so aim a touch lighter than the swatch while mixing.

Don’t chase a perfect match. The painting only needs each colour to be consistent with itself and clearly different from its neighbours — nobody will hold your canvas against the printout. If two of your mixes drift close together, nudge one apart and carry on.

Painting order that keeps colours clean

Paint one number at a time, everywhere it appears, before moving on — it keeps the colour consistent and means one brush-rinse per colour, not per zone. Start with the large, calm background zones to warm up, work roughly from big shapes to small details, and keep coats thin: two thin passes cover better and stay flatter than one thick one. If a light colour has to sit next to a still-wet dark one in oils, come back to it next session rather than risking a muddy edge.

Plan the palette before you print

Here’s the practical trick most people find out too late: the number of colours you’ll mix is decided when you convert the photo, not at the easel. A lower detail level means fewer, larger zones and a shorter shopping-and-mixing session — see how color count changes difficulty. Once the palette suits you, print the blank canvas, transfer the outline onto your canvas, and mix your way down the key. For the broader paper-versus-screen trade-offs, there’s digital vs physical paint by numbers— and if you don’t have a painting yet, turn a photo into one first.