A NSW distillery has sold out of its unique gin after actress Margot Robbie was spotted drinking it.

Robbie posted a photo on Instagram of herself sipping a pink gin and tonic at Gold Coast cafe Bam Bam Bakehouse last weekend, prior to her surprise marriage to partner Tom Ackerley in Byron Bay on Monday.

The snap received one million "likes" on Instagram and sparked thousands of questions about what she was drinking.

It turns out the pretty drop was Ink Gin, an $80 boutique gin produced in the NSW Tweed Valley.

Husk Distillers, which produces Ink Gin, said the gin is actually dark blue, but turns pink when mixed with tonic water.

Owner Paul Messenger told news.com.au: “There are already heaps of gins on the market and we didn’t want to make just another gin. We found this flower called the butterfly pea flower. It’s a blue flower and it’s what we call an acid base regulator. The gin on its own is blue and it can look purple depending on the light.

“But it changes colour when you mix it with anything that’s acidic, and tonic water is acidic. So when you make a classic gin and tonic, it changes the pH levels in the drink, which changes the colour to pink. It’s all natural, all 100 per cent done by this amazing flower.”

Since its Instagram fame, Ink Gin has sold out online and at Dan Murphy’s.

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