If the colour is deep and dense, it’s a full-bodied style with a richer mouthfeel, bolder flavours and higher in alcohol.
While tilting the glass in this way you’ll also get an idea of the wine’s body and flavour intensity. If the colour of the wine is translucent and the edges appear almost water-like, this tells you it’s a lighter style of wine with delicate flavours. If the colour is deep and dense, it’s a full-bodied style with a richer mouthfeel, bolder flavours and higher in alcohol. If tasting red wine, a denser appearance also tells you that the wine is high in tannins.