Yes, it is possible to make white wine from red grapes. The difference between red wine and white wine is not the color of the grapes, but the way the juice is processed.
To obtain white wine from red grapes, the juice is rapidly separated from the grape skin and seeds through a technique called "direct pressure". In this way, the juice does not have time to extract the color from the pigments present in the skin, producing a white wine.
On the other hand, to produce red wine, the juice is left in contact with the skin and sometimes even the seeds for a longer period of time, so that it can extract the pigments present in the skin, thus producing the characteristic color. of red wine.