Have you ever pictured the perfect colour, then watched it turn muddy on your palette?

Mastering Colour Mixing – The Double Primary Method is Holly McWilliams’ in-depth, online colour theory course, for oil and acrylic painters who are ready to understand why their mixes behave the way they do. You’ll explore warm & cool primaries, transparent & opaque pigments, pigment strength, value control, and chroma — the essential building blocks of professional colour mixing.

What makes this course different is that you don’t just learn the theory — with step-by-step demonstrations and hands-on projects you see it in action and practice it yourself. You’ll complete two guided mixing projects that become permanent studio references, helping you long after the course is finished.

Along the way, Holly shares the real-world knowledge she’s gained from decades of painting and teaching — including the mistakes most artists make and how to avoid them. With her signature blend of clarity, humour, kindness, and refreshing honesty, she makes complex ideas feel approachable and even fun to learn.