The media has been quick to turn to science this morning, in a bid to settle the seemingly inexorable debate so we can all have our lives back, but why did no-one think to just ask someone who has actually seen it?
The dress was worn to a Scottish wedding by a bride's mother and posted on Tumblr by 21-year-old singer Caitlin McNeill, who played at the ceremony.
She told Business Insider that she got a good look at it, and is in no doubt over its actual colour.
"I got to the wedding and the mother was wearing the dress," McNeill said. "Obviously it was blue and black."
So there you have it. While there is no right answer with regards to the photo of the dress – we're all individually wired to see different colours due to their varying wavelengths – you can rest assured in the flesh it is blue and black.
For the avoidance of doubt, here it is on sale:
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