The short answer is that oil paint, on its own, is mostly not the problem. Pigment ground in linseed or walnut oil is not something that harms you by sitting on a palette. What deserves care is a narrower list: a handful of pigments, and the solvents that traditionally go with oil painting.
That distinction matters, because the usual advice on this subject is either alarmist or dismissive, and neither helps you decide what to buy.
What is actually in oil paint
Two things: a pigment, and a drying oil that binds it. Linseed is the most common, with walnut, safflower and poppy used where a painter wants less yellowing. The oils themselves are food-grade materials in other contexts and are not a hazard.
The pigment is where the question lives, and it depends entirely on which color you are holding.
The pigments worth knowing about
A minority of traditional artists' pigments are based on heavy metals. Cadmium reds, oranges and yellows, cobalt blue and violet, some manganese colors, chrome pigments, and lead white — sold as flake white or Cremnitz white — all fall into this group.
The realistic risk from these is not what people imagine. You are not absorbing meaningful amounts through your fingertips while painting. The genuine routes are ingestion and inhalation of dry particles: putting a brush in your mouth to point it, eating at the easel, sanding a dried painting, or grinding your own pigment from raw powder. Lead white is the one that warrants real caution rather than sensible habits, and it is labeled accordingly.
Wash your hands before you eat, do not point brushes with your lips, and do not sand a painting without dust protection. That covers it.
If you would rather avoid the question entirely, most manufacturers now sell hue versions — cadmium-free reds and yellows made from modern organic pigments. They behave a little differently in mixing but they are genuinely safe.
Solvents are the real reason oil painting has a reputation
Turpentine and mineral spirits are used to thin oil paint and to wash brushes, and they are the part of the process that actually deserves attention.
They evaporate readily — that is precisely why you can smell them — and the vapor is what you are breathing in a closed room. Prolonged exposure in poor ventilation can cause headaches and lightheadedness, and turpentine in particular can irritate skin on repeated contact. Odorless mineral spirits are lower in aromatic content and less unpleasant, but they still evaporate and still need air moving through the room.
None of this makes oil painting dangerous. It makes it a hobby that needs an open window, a lidded jar rather than an open dish, and rags spread flat to dry rather than balled up. Oil-soaked rags left in a heap can genuinely heat up on their own, which is the one hazard in this whole subject that is more serious than people assume.
Varnish
Traditional picture varnish is a resin dissolved in a solvent, so the same ventilation advice applies while it is going on and while it dries. Spray varnish is the version to be most careful with, because it puts the material into the air as a fine mist.
How acrylic compares
Acrylic paint is pigment suspended in an acrylic polymer emulsion, thinned with water. The pigment question is identical — a cadmium red is a cadmium red whichever binder it sits in — but everything around it changes.
You thin it with water. You wash brushes with soap and water. There is no solvent anywhere in the process unless you deliberately introduce one. As it dries, an acrylic film releases water along with small amounts of ammonia and glycol, which is why a room full of drying acrylic has a faint smell. Ordinary ventilation handles it, and it is a different order of thing from a table of open turpentine.
This is the practical reason paint by numbers kits use acrylic. Our own kits are water-based acrylic with nothing in the box that needs a solvent, which also means the whole thing can be packed up on a kitchen table and put away, which matters more than it sounds if you paint in a shared room. Our note on what is in a paint by numbers kit lists what actually comes with one.
How to read the label
In the United States, art materials sold for consumer use are labeled under a federal law requiring a review for chronic health hazards, and you will see a reference to the ASTM D-4236 standard on the packaging. Materials assessed as having no known health risk in normal use carry an AP seal from the Art and Creative Materials Institute; ones needing a warning carry a CL seal with the specific caution printed.
If a tube carries an AP seal, that is a real assessment and not marketing. If it carries a CL seal, read what the caution actually says — it is usually about a single route of exposure, not a general warning.
The two things people get wrong about acrylic
It dries slightly darker. The binder is milky when wet and clear when dry, so a color looks a shade lighter in the pot than it does on the canvas. The fix is not to add white — that lightens it permanently. The fix is to test a color on a scrap and let it dry before you judge a match.
It dries fast. On a numbered canvas that is mostly an advantage, because adjacent sections stop bleeding into each other quickly. Where it works against you is blending. A stay-wet palette, a light mist of water over the palette rather than over the canvas, or a proper retarder medium all buy you working time. Adding more water does not — past a certain point it thins the film until the canvas shows through.
Do you need to varnish acrylic
Opinions differ, genuinely. A varnish protects the surface from dust and makes cleaning possible, but acrylic films stay slightly soft, and a varnish that later needs removing has to come off with solvents that can affect the paint underneath. Plenty of painters leave acrylic unvarnished and simply keep the work out of direct sun. We go through the arguments in do you need to seal acrylic paintings.
Sensible habits, either way
- Keep paint away from food and out of reach of small children. None of it is edible, including the safe kind.
- Wash your hands when you stop, not just when you finish.
- Open a window if you are using solvents, and spread solvent-soaked rags flat to dry rather than piling them.
- Do not rinse solvents down the sink. Let the residue settle in a jar, pour off the clear liquid to reuse, and take the sludge to household hazardous waste.
- Wash acrylic brushes before the paint dries — soap and warm water is all it needs. Our guide to cleaning fine tip brushes covers the ones that matter.
Which to choose
If you like the long open time of oil and you have somewhere ventilated to work, oil paint with sensible habits is fine and always has been. If you paint at the kitchen table in the evening, acrylic removes the entire question, and that is worth more than any difference in the finished surface. Everything in our kit collection is acrylic for that reason, and the beginner's guide covers how to get started with one.
