Friday Drinks on Radio 4BC 25 April - back label jargon

An example from a McWilliams bottle
A conversation earlier this week with a mate of mine lead me to discuss some of the jargon on the back of wine labels. Most labels state something to the effect of, "Produced with the aid of nut, egg and milk products. Traces may remain". What's all that about?

Have a listen here

Wines to look out for this week include:
Symphony Hill Gewurztraminer 2013 RRP $30

Robert Oatley Wines Signature Series McLaren Vale Shiraz 2012 RRP $23