As promised, here is the tale of how I got the colours to pool so nicely in my smaller Rainbow Cake hat. The pastel rainbow colours of the yarn (Madelinetosh's Pure Merino Worsted in 'Pocket Rainbow') practically demanded that I have a go at controlled colour-pooling, and I couldn't be happier with the way it worked out. :)
The first step, of course, was swatching.
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