The array of colours you can buy can be overwhelming and you definitely don’t need them all! I believe it’s best to start with a few and get to know them well. I would start with two blues, white, a yellow, magenta (not red) and an orange (which must be a single pigment not a mixture). After this, perylene black and a lemon (cool) yellow. Plus a red if you’re missing it.
Acrylics are inter-mixable between brands. Buy the best quality you can afford without feeling inhibited about using it. What you’re paying for in artist’s quality paints is the pigment loading (the amount of pigment in the tube)and the wider range of pigments (colour choices, with series 1 colours being less expensive than series 2,3, etc.). The consistency of the paint is stiffer too, so holds brushmarks more.
The artist’s quality brands I use are the most are Schmincke Primacryl and Golden Heavy Body, and for mid-price Amsterdam Expert. The student-quality paint I use in workshops is Seawhite. I use Seawhite/Amsterdam for the initial blocking in of a painting on a large canvas (“getting rid of the white”) and painting the edges.
WHITE: Titanium white (PW6).
BLUE: My favourites are Prussian blue (PB60 / PB15:1 / PBk7 Schmincke), which I often use instead of black, phthalo turquoise (PB15:4 / PG7 Golden or PB16 Schmincke), and cerulean blue (PB15:3 / PB16 / PW6 Schmincke). I also use all sorts of other blues but almost never ultramarine blue.
YELLOW: Two yellows, one darker/warmer and one lighter/cooler, like the different yellows you get on a daffodil. My favourites are cadmium yellow (PY35) and lemon yellow (PY3).
RED: I use quinacridone magenta (PR122) instead of a red for colour mixing, except when I’m painting something that’s definitely red, such as an apple. Magenta mixes with blues to give the heathery purples typical of Skye. It also produces “interesting pink-greys”, whereas when I’m mixing with a red (or sienna) I find I end up at boring browns too easily.
ORANGE: To get the range of “interesting greys and browns” that comes from mixing orange + blue + white, it needs to be a single-pigment orange not a yellow+red mixture in a tube (the latter will give unwanted greens). My favourites are cadmium orange, PO20, and transluscent orange (PO71 Schmincke).
BLACK: The one black I use is PBk31, which has green undertones, making it ideal for landscapes. It’s sold under different names by different manufacturers including Perylene Black, Perylene Green and Atrament black (Schmincke); look for Pbk31 on the label. Mix with yellow for earthy greens.
PAYNE’S GREY: This is a mixed colour, not a single pigment, and what’s in it differs between manufacturers. I use Payne’s grey acrylic ink a lot for continuous line drawing, specifically FW Artist’s Ink by Daler Rowney (note: not DR System 3). It contains PBk7 / PB15, so is a blue-black.
Remember: Cadmium pigments are toxic, but then paint isn’t meant to be eaten. And don’t lick your brushs to get a nice point.
If you’re interested in paint colours, I recommend Bright Earth by Philip Ball, and the Handprint website which although written about watercolours is relevant as the pigments in all paints are the same.
I mostly buy art supplies from Jackson’s as their prices are good and they don’t have ridiculous shipping costs for the Highlands and islands. If you use this link or click on the photo below, I’ll earn a small affiliate commission on your purchases.