Share 'Blackface, how to?'

Many years ago my group and I did some performances in blackface. At the time we just used some simple black greasepaint and really only did our faces. I would like to investigate a more authentic approach to blacking up and I wondered if any of you have any practical advice about how to do it. I think the first step is to burn some bottle corks in alcohol and I think this was even shown in Spike…