Quick answer: You cannot fully turn regular oil paint into true water-mixable oil at home, because commercial versions use oil that has been chemically modified in manufacturing. What you can do is make your own water-mixable oil paint by grinding dry pigment into a water-mixable linseed oil (sold as a medium), or partly improve water handling by adding water-mixable oil medium to traditional paint. An oil-and-egg emulsion is a historical alternative that also thins with water. Each method has trade-offs, and handling dry pigments requires care.
People usually search how to make water mixable oil paint for one of three reasons: they already own a drawer full of traditional oils and want to skip solvents, they want to save money, or they enjoy making their own paint. All three are reasonable, but the honest answer is that there is no kitchen trick that converts ordinary linseed oil into the modified oil manufacturers use.
There are still practical routes. This guide explains why the conversion is hard, then walks through the methods that do work, their limits and how to do them safely. If you would rather skip the DIY and buy paint ready to use, our review of the best water mixable oil paint sets compares the main options.
Why You Can’t Simply Add Something to Regular Oil Paint
Ordinary linseed oil is nonpolar: it has no attraction to water, which is why water beads on oil paint. Commercial water-mixable oils solve this in the factory, either by chemically modifying the oil molecule so part of it is water-loving, or by blending in carefully balanced emulsifiers so oil and water stay mixed.
At home, adding dish soap or another household surfactant to oil paint can make it accept some water, but the results are unpredictable. Soap residues can weaken the paint film, affect adhesion, attract moisture and may discolor over time. It is fine for a curious experiment but not for paintings you want to last.
Method 1: Grind Your Own Paint With Water-Mixable Linseed Oil
This is the closest you can get to genuine water-mixable oil paint at home. Several manufacturers sell water-mixable linseed oil as a medium for their water-mixable lines. Because the oil itself is already modified, paint made from it with dry pigment behaves like commercial water-mixable oil.
What you need
- Artist-grade dry pigment
- Water-mixable linseed oil (a medium sold by water-mixable oil paint brands)
- A glass slab or thick sheet of tempered glass
- A glass muller (or a stiff palette knife for small batches)
- A palette knife for gathering
- Empty paint tubes or small airtight jars
- A dust mask or respirator rated for fine particles, nitrile gloves and safety glasses
Step-by-step
- Protect yourself. Put on gloves, a particle mask and glasses. Work away from food areas, on a surface you can wipe clean. Avoid any breeze that could lift pigment dust.
- Measure pigment. Place a small heap of pigment, about a tablespoon, on the slab. Make a well in the center.
- Add a little oil. Drip a few drops of water-mixable linseed oil into the well. Pigments vary widely in how much oil they absorb, so add slowly.
- Mix with the knife. Fold pigment and oil together until you have a stiff, crumbly paste. Add drops of oil only until it holds together.
- Mull. Grind the paste with the muller in small circles, using firm, even pressure. Gather it back to the center with the knife and repeat. Grinding disperses pigment particles so the paint is smooth and strong.
- Check consistency. Aim for a texture like toothpaste or commercial tube paint. If it is runny, add pigment; if it is dry and crumbly, add oil a drop at a time.
- Store. Fill empty tubes from the open end with a knife, fold the end twice, and crimp. Or store in a small airtight jar with a layer of plastic wrap on the surface.
- Clean up. Wipe the slab and muller with paper towels, then wash with soap and water. Wet-wipe surfaces rather than sweeping dry pigment.
How it performs
Homemade paint from water-mixable oil thins with modest amounts of water and cleans up with soap and water, like commercial versions. It may handle a little differently: commercial makers often add small amounts of stabilizers to keep paint from separating in the tube. Homemade paint may separate over time, so stir or knead tubes before use.
Which pigments are easiest to start with?
| Pigment group | Grinding ease | Notes |
|---|---|---|
| Earth colors (ochres, siennas, umbers, oxides) | Easy | Inexpensive, low hazard, good first projects |
| Ultramarine blue | Moderate | Can be stringy; benefits from thorough mulling |
| Titanium white | Moderate | Bulky; needs patience to reach smooth texture |
| Phthalo and quinacridone colors | Difficult | Very fine, staining and dusty; spread easily through a workspace |
| Cadmium and cobalt colors | Moderate | Toxic; require strict dust control |
Oil absorption also differs. Earth colors and many organics take a lot of oil; dense pigments such as some whites take relatively little. Keep notes of how much oil each batch needed so you can repeat it.
Method 2: Add Water-Mixable Medium to Traditional Oil Paint
If you have traditional oils and want them to tolerate a little water, mixing in water-mixable oil or medium can partly help. Results vary with the ratio.
- A small amount of water-mixable medium in traditional paint will not make it water-mixable. The traditional oil dominates.
- Combining traditional oil paint with a larger share of water-mixable paint or medium shifts the balance. Manufacturers commonly say mixes remain water-friendly when traditional oil is kept to a minority, often cited as roughly a quarter to a third or less.
- Beyond that, treat the mix as traditional oil and clean with oil or solvent first.
The practical takeaway: you can blend your existing traditional colors into a water-mixable palette in small amounts without ruining water cleanup, but you cannot convert a whole traditional set this way.
A simple test
- Mix a small amount of your traditional color with water-mixable medium at a chosen ratio.
- Add a few drops of water and stir with a knife.
- If it forms a smooth, creamy paint, the ratio works. If water beads or the paint turns stringy, increase the water-mixable proportion.
- Brush a stroke on primed paper and wash the brush with soap and water to test cleanup.
Method 3: Historical Egg-Oil Emulsion (Tempera Grassa)
Before modern chemistry, painters made paint that combined oil and water using egg yolk, which contains natural emulsifiers. Such mixtures are often called tempera grassa or egg-oil emulsions. They can be thinned with water and dry faster than oil paint, with a satin finish.
A basic approach
- Separate an egg yolk from the white, roll it on a paper towel to dry the sac, pierce it and let the yolk drain into a jar, discarding the membrane.
- Add drying oil (linseed or stand oil) to the yolk a few drops at a time, shaking or stirring to emulsify. Recipes vary; many start with a small proportion of oil relative to yolk.
- Add an equal or similar volume of water and mix well. This is your emulsion binder.
- Mix the binder with pigment or a pigment paste on the palette as needed.
This is a different medium, not a substitute for water-mixable oil paint. It spoils quickly, typically within days even refrigerated, behaves more like egg tempera, and works best on rigid, absorbent panels. It is worth trying if you are interested in historical techniques, but it does not replicate the slow-drying, buttery feel of oil.
Comparing the Methods
| Method | True water-mixable? | Effort | Shelf life | Best for |
|---|---|---|---|---|
| Grind pigment with water-mixable linseed oil | Yes | High | Good if sealed; may separate | Paint makers, custom colors |
| Add water-mixable medium to traditional oil | Partial, ratio-dependent | Low | Same as source paints | Using up existing traditional colors |
| Egg-oil emulsion | Water-thinnable, but a different medium | Moderate | Days | Historical technique experiments |
| Adding soap to oil paint | Unreliable | Low | Unknown | Experiments only; not archival |
| Buy commercial water-mixable oils | Yes | None | Years in tube | Most painters |
Safety When Making Your Own Paint
Dry pigment is the most hazardous form of any paint material because fine particles can be inhaled. Some pigments contain toxic metals; cadmium, cobalt, manganese and lead-based pigments are the usual examples, and lead white is especially hazardous.
- Wear a properly fitted particulate respirator when handling dry pigment.
- Wear gloves and avoid touching your face.
- Never eat, drink or prepare food in the same area.
- Wet-wipe surfaces; do not sweep or blow pigment dust.
- Read the safety data sheet for each pigment.
- Store pigments in labeled, sealed containers out of reach of children and pets.
- Store oily paper towels in a sealed metal container with water or lay them flat to dry, since oil-soaked waste can self-heat.
Beginners making paint for the first time can start with lower-hazard earth pigments such as yellow ochre, red oxide and burnt sienna, which also tend to grind easily.
Is Making Water-Mixable Oil Paint Worth It?
It depends on your goal.
- To save money: Usually not. Dry pigments, water-mixable oil, a muller and tubes add up, and grinding takes time. Earth colors can be economical; many others are not.
- To avoid solvents with your existing oils: Partly. Blending in water-mixable medium or paint helps a little, but switching to commercial water-mixable paint or a solvent-free traditional routine is usually more practical.
- For the craft: Yes. Making paint teaches you a lot about pigments, oil absorption and paint texture, and you can create colors and consistencies you cannot buy.
Alternative: solvent-free traditional oils
If your real goal is avoiding solvent, you can keep your traditional oils. Thin with a small amount of oil or a solvent-free medium, wipe brushes thoroughly, clean them in safflower or vegetable oil, then wash with soap and water. This gives a fume-free routine without changing your paint at all.
Labeling and Testing Your Batches
Label every tube or jar with the pigment name, pigment code if known, the oil used and the date. Before using a new batch in a serious painting, brush a sample onto primed paper, thin part of it with water, and note how it handles and how long it takes to become touch-dry. Keeping these test swatches in a notebook builds a reference that makes later batches faster and more consistent.
Troubleshooting Homemade Paint
| Problem | Likely cause | Fix |
|---|---|---|
| Gritty texture | Not mulled enough, coarse pigment | Mull longer in small batches |
| Oily puddle in tube | Too much oil, separation | Add pigment; knead tube before use |
| Stiff, crumbly paint | Too little oil | Add oil drop by drop |
| Doesn’t accept water | Too much traditional oil in mix | Increase water-mixable oil proportion |
| Weak color | Low pigment load | Add more pigment and mull again |
| Paint dries in tube | Air in tube or loose crimp | Fill carefully, fold and crimp tightly |
FAQs
Can you make regular oil paint water mixable?
Not completely. You can improve water tolerance by blending in water-mixable medium or paint, but the traditional oil limits how much water the mix will accept.
Can I add dish soap to oil paint to make it water-soluble?
It may let the paint take some water, but soap can weaken and discolor the film. It is fine as an experiment and not recommended for lasting work.
What is water-mixable linseed oil?
It is linseed oil that has been modified by the manufacturer so it can mix with water. It is sold as a medium for water-mixable oil paints and can be used to make your own paint from pigment.
Can I mix water-mixable oils with regular oils?
Yes. Keep traditional oil to a minority share if you want to keep water cleanup. Larger amounts turn the mix into traditional oil paint.
Is homemade oil paint as good as store-bought?
Carefully made paint from quality pigment can be excellent. It may lack stabilizers, so it can separate, and consistency varies between batches.
Is egg tempera the same as water-mixable oil paint?
No. Egg tempera uses egg yolk as a binder and dries quickly. Egg-oil emulsions sit between tempera and oil, but neither behaves like water-mixable oil paint.
Final Thoughts
The realistic answer to making water-mixable oil paint at home is to start with an oil that is already modified, then grind your own colors, or to blend water-mixable medium into traditional paint in modest ratios. Everything else is either a different medium or an experiment.
For most painters, ready-made paint is simpler and more consistent. Compare quality, color range and value in our guide to the top-rated water-mixable oil sets, and keep paint making as a craft project for the colors you cannot buy.
