I HAVE BEEN RELIABLY INFORMED THIS T-SHIRT IS PURPLE

This is Kuratau (The southern end of Lake Taupo, New Zealand), and @kiwideb says her t-shirt is definitely purple (not indigo)

And just in case I have also included this photo of the car park building in Courtney Place (Wellington NZ) that had to be demolished after the earthquake last November - I missed putting in entries for all the other colours, but this one sort of covers the spectrum, so is hopefully good for purple as well.

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MY MINIMALIST STEEMIT SIGNATURE

For more info, see MY WHOPPING BIG STEEMIT SIGNATURE