Welcome back to the Art of Crochet blog!
Why call this a two-colour square when there are clearly four colours, I hear you cry? Well, yes there are four colours ‘altogether’, but there are also two colours in one round, the Lime Green and the Teal. The trick is to change colour at the end of the last treble in each group, holding the second colour at the back and binding it into the next batch of trebles.
Here’s a short film, including details of the colour-changing extravaganza.