How to choose two colours that will fade?

I was asked how I chose my colours for the original Millesime, in other words, how to make sure two colours will fade into each other instead of creating stripes?

Here's my tip. To achieve a fading effect, it's all about contrast, not colour. And constrast... let's be honest, it's not always obvious at first sight whether it's strong or not! To uncover the secret contrast within your potential color combination, one simple hack: take a picture of your colors next to one another in daylight and switch the picture to black & white. The contrast will become obvious! 

I had lots of fun putting a little selection together to get you started. So will it fade or will it stripe?

And what about you? Are you #teamfade or #teamstripe? Do let me know your thoughts! ^-^