from theguardian.com

So what is orange wine, or amber wine, as it’s sometimes called? Well, it’s not wine made from oranges, but rather it’s a white wine made like a red by fermenting the juice on the skins. This gives it a more full-bodied, tannic character, and the depth of colour, which ranges from pale gold to deep bronze, depends on how long the contact is for; sometimes days, sometimes months. Normally, the practice goes hand in hand with natural winemaking (natural yeasts and low sulphites), which can make the outcome challenging if you’re used to more conventional wines. (Like red wines, you may need to decant them, too.) But, served at cool room temperature, as they should be, orange wines have a depth of flavour that many whites lack.