How to Tint and Color Resin Castings
Share
How to Tint and Color Resin Castings
You stir a drop of blue into your resin, pour it, and it comes out looking like a gummy bear when you wanted sea glass — or murky when you wanted vivid. Color in resin is its own little craft, and most of it hinges on one decision you make before you ever pick a shade.
In this guide
Before you pick a color, pick a behavior
Almost everyone approaches resin color the same way: they think about the shade. Teal, amber, blush. But the shade is the easy part. The thing that actually decides whether your casting looks like stained glass or a solid candy button is something else entirely — how the color handles light.
That’s the real fork in the road. Some colorants let light pass straight through the resin, so the piece glows and you can see into it. Others scatter and block light, so the resin turns solid and opaque, like painted plastic. Transparent or opaque. Once you know which one you’re after, the rest of the choices — what to buy, how much to add, what effect you’ll get — basically make themselves.
And the two main families map cleanly onto those two behaviors. Dyes dissolve into the resin and tint it while keeping it see-through. Pigments are solid particles that stay suspended and make the resin opaque. That’s the whole headline. Everything else in this guide is detail hanging off that one distinction.
“Ask yourself one thing first: do you want light to travel through the color, or bounce off it? That answer is dye versus pigment.”
So let’s make it tangible. The studio just below lets you flip between dye, pigment, and mica, pick a color, and dial the amount up and down — and watch the resin go from glassy and translucent to flat and solid in real time. Play with it for a minute and the difference will stick better than any paragraph I could write.
The opacity & color studio
There’s a gem behind the resin in the window below. With a dye, you’ll see it tinted right through the color. Switch to a pigment and crank the amount, and watch it vanish as the resin turns opaque. That disappearing gem is the entire difference between the two, made visible.
A clear, saturated tint that still lets light through — ideal for gems, glass, and water effects.
Two things to notice as you play. First, no matter how far you push a dye, it never goes truly opaque — it just gets deeper. Transparency is baked into how it works. Second, a pigment starts off milky and translucent at a tiny dose, then fills in to a flat, solid color as you add more. That little milky in-between stage is genuinely useful — it’s how you get a soft, frosted translucence rather than full opacity.
Mica sits in its own lane: it’s semi-opaque and reflective, so instead of either passing or blocking light, it bounces it back as shimmer. That’s what gives you pearl and metallic finishes. Browse the colorant range in the pigments & colorants collection.
Pigments, dyes, and the rest of the cast
Four colorants cover almost everything you’ll want to do. Tap through to see how each behaves, what it’s best at, and how kindly it treats your cure.
Dyes — for everything you want to see through
Liquid resin dyes dissolve completely, tinting the resin like colored cellophane. They’re what you reach for whenever light should travel through the piece: faux gemstones, stained-glass panels, ocean and river pours, layered translucent work. A little goes a very long way — dye is potent, so add it a drop at a time. And because it dissolves rather than sitting as particles, it’s generally gentle on cure.
Pigments — for solid, opaque color
Pigments are finely ground solids suspended in a paste or powder. They make resin opaque, which is exactly what you want for solid colors, bright castings that read as a single hue, or pieces where you need to hide whatever’s embedded inside. White pigment is the workhorse here — it’s how you lighten a color and push it toward opacity. The trade-off is dose sensitivity: pile in too much and you can throw off the resin-to-hardener balance and stop it curing.
Mica & alcohol ink — the specialists
Mica powder gives you pearl, metallic, and shimmer because its flakes reflect light — gorgeous swirled into a dye for depth, or used alone for a frosty metallic. Alcohol ink is the wildcard: intensely vivid and lovely for blooming, petri-style effects, but it can bleed, may fade over time, and will fight your cure if you overdo it. Use it sparingly and test first. You’ll find resin-specific options in the pigments & colorants collection.
What the light is actually doing
It all comes back to one thing: where the light goes. Here’s the same beam of light meeting three differently colored castings.
Dye lets the beam travel straight through and out, so the casting glows. A small amount of pigment scatters it for a soft, translucent look. A full dose of pigment bounces it off the surface entirely — that’s opacity. Same light, three colorant choices.
This is also why the amount you add changes the result so much, not just the color. The middle cube and the right cube could be the exact same pigment — the only difference is how much went in. A pinch gives you that dreamy, frosted translucence; a full measure gives you flat, solid color. If you’re chasing a specific look, think about dose as deliberately as you think about hue.
The mixing rules worth memorizing
Coloring resin is forgiving right up until it isn’t. These four habits keep your castings vivid and, just as importantly, fully cured.
Stay under ~10%
Keep total colorant to a small fraction of the resin. Too much and it may never fully cure.
White is your dial
Add white pigment to lighten a color and push it from translucent toward solid.
Mix small first
Try a color in a tiny batch before committing a whole pour. Cured resin can shift the shade.
Layer for dimension
Pour, let it gel, then add the next colored layer to build real 3D depth and effects.
The Sticky-Resin Culprit
If a colored casting comes out tacky, soft, or never fully sets, the usual suspect is too much colorant — especially non-resin-specific stuff like craft acrylic or a heavy hand with alcohol ink. Colorants that aren’t part of the resin chemistry dilute the resin-to-hardener ratio. Stick to resin-specific dyes and pigments, keep the dose modest, and mix thoroughly, scraping the sides and bottom of your cup. Shop tested options in the casting collection.
Color recipe builder
Tell it the look you’re going for and it’ll suggest the colorant, the rough dose and method, and what to watch out for.
Build your color recipe
Pick all three, then build your recipe.
Frequently asked questions
It comes down to light. A dye dissolves into the resin and tints it while staying transparent, so light passes through and the piece glows — think stained glass or a faux gem. A pigment is a solid particle that stays suspended and makes the resin opaque, so light scatters or bounces off and you get a solid, flat color. Pick a dye when you want to see through the piece, and a pigment when you want solid color. You can also blend them: a touch of pigment in a dyed resin gives a soft, milky translucence.
Less than you think — keep total colorant to a small fraction of the resin, commonly cited as under about ten percent by volume, and ideally less. Resin cures through a chemical reaction between resin and hardener, and anything you add dilutes that balance. Dyes and pigments are potent, so a little produces strong color; you rarely need much. If you want a deeper shade, reach for a more concentrated colorant rather than simply dumping in more, which risks a cast that stays soft or never fully sets.
In small amounts, sometimes — but cautiously. Alcohol ink gives intense, beautiful blooms and is popular for petri-style art, though it can bleed, may fade over time, and will inhibit cure if you use too much. A tiny bit of acrylic paint can tint resin, but acrylic is water-based and not made for resin chemistry, so more than a touch tends to leave you with sticky, undercured results. For reliable color, resin-specific dyes and pigments are worth it; they’re formulated to color strongly without sabotaging the cure.
Nine times out of ten, too much colorant. When the colored portion gets too large relative to the resin, or you’ve used something that isn’t made for resin, the resin-to-hardener ratio is thrown off and the reaction can’t complete — leaving a tacky or soft cast. The fixes are simple: use resin-specific colorants, keep the dose modest, measure your resin and hardener accurately, and mix thoroughly so there are no unmixed pockets clinging to the sides or bottom of the cup. When in doubt, less color and a clean ratio win.
Translucence lives in the small doses. Use just a touch of pigment — that milky in-between stage before it fills in to solid color is exactly the frosted, see-through-but-not-clear look you’re after. A dye on its own stays transparent no matter how much you add, so for a soft translucent effect, either keep a dye light or add a small amount of pigment (often white) to a dyed resin to cloud it slightly. Test in a small batch, because the line between translucent and opaque is just a matter of a little more pigment.
Mica powder. Its fine, flat flakes reflect light, which is what creates that pearl, metallic, or shimmer effect — something neither a dye nor a standard pigment can do on its own. Stir mica into clear or lightly dyed resin and it suspends throughout for an all-over shimmer, or swirl it in gently for veins of metallic movement, which is how a lot of faux-stone and galaxy effects are made. It’s semi-opaque by nature and generally gentle on cure, so it’s an easy, dramatic one to experiment with.
Pour something that glows
Dye to let the light through, pigment for solid color, mica for shimmer. Get the colorants and clear resin to make any of it.