Emulsion is the bread and butter of British decorating — the water-based paint you put on walls and ceilings. The name comes from how it's made: pigment and an acrylic or vinyl binder are suspended (emulsified) in water. As the water evaporates, the binder particles fuse together and leave a tough, breathable film behind. That water base is why emulsion is low-odour, dries quickly, and cleans off brushes under the tap — no white spirit needed.
It's distinct from the oil- or water-based trim paints (eggshell, satinwood, gloss) you'd use on woodwork and metal, which are harder-wearing and built to take knocks. Emulsion is softer and designed for the large, flat areas of a room.
Emulsion comes in a range of sheen levels. Matt is the most popular — it hides wall imperfections beautifully and gives that flat, chalky look everyone's after. Farrow & Ball's Estate Emulsion and Little Greene's Intelligent Matt are both cracking examples. If you want something more wipeable for a kitchen or hallway, go for a modern matt or soft sheen, like Dulux Easycare or Crown's washable ranges, which take a damp cloth without rubbing off.
A common question: *can I use emulsion in a bathroom?* Standard emulsion struggles in steamy rooms — you want a moisture-resistant formulation or a dedicated bathroom paint. And on bare new plaster, always thin your first coat into a mist coat (roughly 30% water) so it soaks in and bonds properly.
For colour, emulsion is where you'll spend most of your time choosing. A warm off-white like Farrow & Ball Pointing or a calm grey-green like Mizzle both sing in matt emulsion across a whole room.
Practical tip: buy a sample pot, paint a big patch, and live with it for a couple of days before committing the whole tin — emulsion shifts character with the light far more than the chart suggests.