Mark with the greatest respect for the work you have been doing in this forum, I would like to remind you that I posted that "the spiced oil" was the key to making a good BIR curry. I have been using this method for years, taking the excess oil from my base and re-using it each time I made another. Obviously the smell and taste of the oil can change from base to base - i.e if I use carrot and green pepper in the base I get a different aromo and taste than if I use say just the basic onions, garlic etc with a few whole spices in it. Then of course if you make a curry with the spiced oil (a little more than usual) and then take some off and reuse that it turns out even better, that I can promise you, I know some are sceptical of this procedure, but I am quite sure that in restaurants there is contamination with pans and spoons used. (Not too hot on the washing up) Keep the good work up, I look forward to your post.