First, You need to raise the cup to see the light or the light of the sun and look for the depth of the normal color and intensity of the color and then swing for 2 - 3 around to see the viscosity or to the flow by the view from the water or wine called the tear or leg, which must be to flow to the bottom of the glass is very slow mean that the wine is the body a lot but if the wine to flow to the bottom of the glass are speed means that the wine is the amount of water