Talk:Nigrescence

Some references:
 * http://64.233.161.104/search?q=cache:Ddg2Q3t51BMJ:www.mutombo-nkulu-nsengha.org/index.php%3Foption%3Dcom_content%26task%3Dview%26id%3D72%26Itemid%3D47+negrescence&hl=en&gl=us&ct=clnk&cd=10&client=firefox-a
 * http://www.geocities.com/farthegn/page29b.html