How to Blend Colors in Paint by Numbers – Simple Techniques

Paint by numbers gives you clear section boundaries and numbered colors — but following the numbers strictly isn't the only way to paint. Blending colors at the borders between sections transforms a flat, graphic result into something that looks genuinely painted. Here's how to do it.

Why Blending Matters

The numbered sections in a paint by numbers canvas represent discrete color zones. When filled exactly as instructed, the result has clean, defined edges between colors. This looks great for many subjects — bold animals, graphic landscapes, abstract compositions.

But for subjects with natural gradients — skin tones, sky fading from blue to orange, fur, petals — hard edges between sections can look unnatural. Blending softens those transitions and gives the painting a more professional, hand-painted quality.

The Basic Wet-on-Wet Blend

The most effective blending technique uses wet paint.

How to do it:

1. Fill one section with its correct color — leave it wet, don't let it dry
2. Immediately fill the adjacent section with its correct color
3. While both are still wet, use a clean, barely-damp brush to stroke along the border between them
4. Use light, short strokes that pull slightly from each color toward the other
5. Don't overwork it — 3–5 strokes is usually enough

The result: A soft transition zone at the border rather than a hard line.

Best for: Sky sections (light to dark blue), skin tones (highlight to shadow), fur and hair, flower petals, water reflections.

The Dry Brush Blend

For more control — or when you're blending over already-dried sections.

How to do it:

1. Load a small brush with a very small amount of the lighter of the two colors
2. Remove most of the paint by wiping on a paper towel until the brush is nearly dry
3. Lightly feather the brush along the border of the darker section, pulling the lighter color slightly into it
4. Repeat in the opposite direction with the darker color
5. Build up gradually — this technique rewards patience over speed

The result: A subtle, feathered transition that looks like the colors naturally merge.

Best for: Adding highlights, softening edges on portraits, blending fur in animal paintings.

Blending With a Fan Brush

A fan brush (sold separately, not usually included in kits) is specifically designed for blending and creating soft textures.

How to use it:

• Load both colors lightly on opposite sides of the fan
• Lightly drag across the border in a fanning motion
• The natural spread of the bristles creates a gradient automatically

Fan brushes work best on larger sections. For small sections, a flat or round brush gives more control.

When NOT to Blend

Blending every border makes a painting look muddy and overworked. Reserve blending for:

• Natural gradients in the subject — sky, skin, water, fur, petals
• Light-to-shadow transitions — where a highlight meets a mid-tone or shadow
• Background-to-subject edges — where you want the subject to feel grounded in the background

Leave hard edges for:

• Bold graphic elements — outlines, defined shapes, text
• High-contrast areas — dark shadows next to bright highlights where definition creates drama
• Small sections — blending tiny sections usually just muddies them

Blending on a Digital Canvas

If you're painting digitally on TryPaintByNumbers.com, blending works differently:

• Use the brush tool (not bucket fill) near borders and manually paint transitional strokes
• Zoom in to the border area for more precision
• The brush tool lets you paint freehand over section boundaries the same way you would on a physical canvas
• There's no wet-on-wet effect digitally, but careful brushwork along borders achieves the same visual result

The advantage of digital: you can undo immediately if a blend doesn't look right.

Color Theory for Better Blends

Understanding a little color theory makes blending decisions easier:

Analogous colors blend easily — colors that sit next to each other on the color wheel (blue and blue-green, orange and yellow) blend naturally with minimal muddiness.

Complementary colors don't blend well — colors opposite on the color wheel (red and green, blue and orange) mix to produce brown or grey. At a border between complementary colors, use very minimal blending — a hard edge usually looks better.

Light always goes toward warm — when in doubt, blend toward a slightly warmer tone in the lighter areas and cooler in the shadows. This mimics natural light behavior and looks more realistic.

Practice Blend: Step by Step

If you want to practice before attempting on your main canvas:

1. Get a small piece of watercolor paper or cardstock
2. Paint a stripe of one color from your palette
3. Paint an adjacent stripe of a neighboring color while the first is still wet
4. Practice the wet-on-wet technique at the border
5. Let dry, assess the result
6. Try again with the dry brush technique

Five minutes of practice on scrap paper saves hours of frustration on your main canvas.

Summary

Blending is optional — many beautiful paint by numbers results use no blending at all. But if you want to push your canvas beyond "filled in" toward "genuinely painted," learning to blend at key borders is the single biggest technique upgrade available to you.