Can you use white wine in place of red wine in a bolognese sauce?

I have done so and it tasted quite good but didn't give the depth of colour we have come to expect from said sauce

You can use white wine even if the authentic Italian recipe calls for red wine because it wroks well with red meat. If you are using a while wine, chose a good one from the reagion where the recipe is from. In this case Bologna in the region of Emilia.