Always a pleasure to read you IF. I recall Boiz said that and so did DuBois on discrimination issues in US. But I recall the theory and to paraphrase: "a drop of black blood makes him/her black and not the other way around". Many still subscribe to that. To give an example, I have some blond haired, blue-eyed "black" children (a throw back on their genes) who call themselves black. The situation of Caste may not be the same as we are talking not talking about visible color. The thought issues about caste is also ingrained within religion, cultural practise and tradition that we are looking at a whole chunk of de-construction here.